TY  - JOUR
AU  - Rančić, Milica
AU  - Popović, Mlađan
AU  - Milić, Goran
AU  - Todorović, Nebojša
AU  - Veizović, Marko
AU  - Gavrilović-Grmuša, Ivana
PY  - 2024
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1494
AB  - This study explores the potential of using condensate generated during beech wood steaming (BSC) as an eco-friendly additive in urea-formaldehyde (UF) adhesives for wood-based panel (WBP) production. The research aimed to assess the hardening behavior of pure commercial UF resin and UF with added condensate (UF-BSC), investigating the potential catalytic effect of BSC on the hardening characteristics of UF adhesives. Changes in chemical structure after the curing process were observed with Fourier transform infrared spectroscopy (FTIR). The curing kinetics was studied by differential scanning calorimetry (DSC) under a dynamic scanning regime with heating rates of 5, 10, and 20 degrees C/min. Obtained data were analyzed using Kissinger-Akahira-Sunose (KAS) and Friedman (FR) kinetic iso-conversional methods to estimate the activation energy (Ea) of the curing reaction in the investigated UF adhesive systems. The results of DSC analysis imply that BSC lowers the temperature of the curing reaction of UF adhesive along with the prolongation of the curing reaction. The obtained kinetic data supported by FTIR and chemical analysis suggest that phenolic compounds present in BSC interfere with the main curing reactions leading to lower peak temperatures but higher activation energy. & Tcy;his suggests that BSC increased the number of active sites involved in the reaction and, consequently, the number of collisions. BSC, as wastewater of the wood processing industry, can be efficiently utilized as an environmentally friendly, inexpensive substitute for deionized water in UF adhesive formulations for WBP manufacturing.
T2  - European Journal of Wood and Wood Products
T1  - The effect of the beech wood steaming condensate on curing behaviour of urea-formaldehyde adhesive
DO  - 10.1007/s00107-024-02151-6
UR  - conv_1827
ER  - 

@article{
author = "Rančić, Milica and Popović, Mlađan and Milić, Goran and Todorović, Nebojša and Veizović, Marko and Gavrilović-Grmuša, Ivana",
year = "2024",
abstract = "This study explores the potential of using condensate generated during beech wood steaming (BSC) as an eco-friendly additive in urea-formaldehyde (UF) adhesives for wood-based panel (WBP) production. The research aimed to assess the hardening behavior of pure commercial UF resin and UF with added condensate (UF-BSC), investigating the potential catalytic effect of BSC on the hardening characteristics of UF adhesives. Changes in chemical structure after the curing process were observed with Fourier transform infrared spectroscopy (FTIR). The curing kinetics was studied by differential scanning calorimetry (DSC) under a dynamic scanning regime with heating rates of 5, 10, and 20 degrees C/min. Obtained data were analyzed using Kissinger-Akahira-Sunose (KAS) and Friedman (FR) kinetic iso-conversional methods to estimate the activation energy (Ea) of the curing reaction in the investigated UF adhesive systems. The results of DSC analysis imply that BSC lowers the temperature of the curing reaction of UF adhesive along with the prolongation of the curing reaction. The obtained kinetic data supported by FTIR and chemical analysis suggest that phenolic compounds present in BSC interfere with the main curing reactions leading to lower peak temperatures but higher activation energy. & Tcy;his suggests that BSC increased the number of active sites involved in the reaction and, consequently, the number of collisions. BSC, as wastewater of the wood processing industry, can be efficiently utilized as an environmentally friendly, inexpensive substitute for deionized water in UF adhesive formulations for WBP manufacturing.",
journal = "European Journal of Wood and Wood Products",
title = "The effect of the beech wood steaming condensate on curing behaviour of urea-formaldehyde adhesive",
doi = "10.1007/s00107-024-02151-6",
url = "conv_1827"
}

Rančić, M., Popović, M., Milić, G., Todorović, N., Veizović, M.,& Gavrilović-Grmuša, I.. (2024). The effect of the beech wood steaming condensate on curing behaviour of urea-formaldehyde adhesive. in European Journal of Wood and Wood Products.
https://doi.org/10.1007/s00107-024-02151-6
conv_1827

Rančić M, Popović M, Milić G, Todorović N, Veizović M, Gavrilović-Grmuša I. The effect of the beech wood steaming condensate on curing behaviour of urea-formaldehyde adhesive. in European Journal of Wood and Wood Products. 2024;.
doi:10.1007/s00107-024-02151-6
conv_1827 .

Rančić, Milica, Popović, Mlađan, Milić, Goran, Todorović, Nebojša, Veizović, Marko, Gavrilović-Grmuša, Ivana, "The effect of the beech wood steaming condensate on curing behaviour of urea-formaldehyde adhesive" in European Journal of Wood and Wood Products (2024),
https://doi.org/10.1007/s00107-024-02151-6 .,
conv_1827 .

TY  - JOUR
AU  - Drpić, Aleksandar D.
AU  - Popović, Jasmina
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
PY  - 2022
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1339
AB  - Cilj ovog rada je analiza hemijskog sastava tretiranog i netretiranog iverja drveta poljskog jasena (Fraxinus angustifolia Vahl. ssp. Pannonica Soó & Simon). U cilju utvrđivanja uticaja predtretmana vrelom vodom na promene hemijskog sastava, određivan je sadržaj vlage, celuloze, lignina, minerala (pepela), ekstraktiva rastvorljivih u vreloj vodi, ekstraktiva rastvorljivih u organskim rastvaračima, za tretirano i za netretirano drvno iverje pomenute vrste. Rad je urađen u skladu sa standardnim metodama TAPPI i ASTM. Svojstva drvnog iverja tretiranog 30 min i 60 min upoređena su sa netretiranim drvnim iverjom i definisane su promene u hemijskom sastavu koje su nastale kao rezultat primenjenih tretmana. Istraživanje je obavljeno u kontrolisanim uslovima u laboratoriji, a rezultati tretmana su bili predmet uporedne analize. Primenjeni tretmani su statistički značajno uticali na smanjenje sadržaja ekstraktiva. Sadržaj celuloze i hemiceluloza povećan je kod tretiranog drvnog iverja u odnosu na netretirano, dok se sadržaj lignina nije značajno promenio.
AB  - The goal of this paper is to analyze the chemical composition of untreated and treated wooden chips from the native narrow-leaved ash (Fraxinus angustifolia Vahl. ssp. Pannonica Soó & Simon). In order to determine the effect of pretreatment with liquid hot water (LHW) on changes in chemical composition, the content of moisture, cellulose, lignin, minerals (ash), extractives soluble in hot water, extractives soluble in organic solvents, for treated and for untreated wooden chips was determined. This was done in accordance with TAPPI and ASTM standard methods. The properties of wooden chips, treated for 30 min and 60 min at a temperature of 100 °C, are compared to untreated wooden chips and changes in the chemical composition that occurred are defined as a result of the applied treatments. The research was performed under controlled conditions in a laboratory, and the results of treatments were the subject of comparative analysis. Applied treatments had a statistically significant effect on decreasing the content of extractives. The content of cellulose and hemicellulose increased in the treated wooden chips compared to untreated wooden chips, while the lignin content did not significantly change.
PB  - Univerzitet u Nišu - Tehnološki fakultet, Leskovac
T2  - Advanced Technologies
T1  - Analiza uticaja predtretmana vrelom vodom (LHW) na hemijski sastav drvnog iverja
T1  - Analysis of the influence of pre-treatment with liquid hot water (LHW) on the chemical composition of wooden chips
EP  - 47
IS  - 2
SP  - 40
VL  - 11
DO  - 10.5937/savteh2202040D
UR  - conv_795
ER  - 

@article{
author = "Drpić, Aleksandar D. and Popović, Jasmina and Popović, Mlađan and Điporović-Momčilović, Milanka",
year = "2022",
abstract = "Cilj ovog rada je analiza hemijskog sastava tretiranog i netretiranog iverja drveta poljskog jasena (Fraxinus angustifolia Vahl. ssp. Pannonica Soó & Simon). U cilju utvrđivanja uticaja predtretmana vrelom vodom na promene hemijskog sastava, određivan je sadržaj vlage, celuloze, lignina, minerala (pepela), ekstraktiva rastvorljivih u vreloj vodi, ekstraktiva rastvorljivih u organskim rastvaračima, za tretirano i za netretirano drvno iverje pomenute vrste. Rad je urađen u skladu sa standardnim metodama TAPPI i ASTM. Svojstva drvnog iverja tretiranog 30 min i 60 min upoređena su sa netretiranim drvnim iverjom i definisane su promene u hemijskom sastavu koje su nastale kao rezultat primenjenih tretmana. Istraživanje je obavljeno u kontrolisanim uslovima u laboratoriji, a rezultati tretmana su bili predmet uporedne analize. Primenjeni tretmani su statistički značajno uticali na smanjenje sadržaja ekstraktiva. Sadržaj celuloze i hemiceluloza povećan je kod tretiranog drvnog iverja u odnosu na netretirano, dok se sadržaj lignina nije značajno promenio., The goal of this paper is to analyze the chemical composition of untreated and treated wooden chips from the native narrow-leaved ash (Fraxinus angustifolia Vahl. ssp. Pannonica Soó & Simon). In order to determine the effect of pretreatment with liquid hot water (LHW) on changes in chemical composition, the content of moisture, cellulose, lignin, minerals (ash), extractives soluble in hot water, extractives soluble in organic solvents, for treated and for untreated wooden chips was determined. This was done in accordance with TAPPI and ASTM standard methods. The properties of wooden chips, treated for 30 min and 60 min at a temperature of 100 °C, are compared to untreated wooden chips and changes in the chemical composition that occurred are defined as a result of the applied treatments. The research was performed under controlled conditions in a laboratory, and the results of treatments were the subject of comparative analysis. Applied treatments had a statistically significant effect on decreasing the content of extractives. The content of cellulose and hemicellulose increased in the treated wooden chips compared to untreated wooden chips, while the lignin content did not significantly change.",
publisher = "Univerzitet u Nišu - Tehnološki fakultet, Leskovac",
journal = "Advanced Technologies",
title = "Analiza uticaja predtretmana vrelom vodom (LHW) na hemijski sastav drvnog iverja, Analysis of the influence of pre-treatment with liquid hot water (LHW) on the chemical composition of wooden chips",
pages = "47-40",
number = "2",
volume = "11",
doi = "10.5937/savteh2202040D",
url = "conv_795"
}

Drpić, A. D., Popović, J., Popović, M.,& Điporović-Momčilović, M.. (2022). Analiza uticaja predtretmana vrelom vodom (LHW) na hemijski sastav drvnog iverja. in Advanced Technologies
Univerzitet u Nišu - Tehnološki fakultet, Leskovac., 11(2), 40-47.
https://doi.org/10.5937/savteh2202040D
conv_795

Drpić AD, Popović J, Popović M, Điporović-Momčilović M. Analiza uticaja predtretmana vrelom vodom (LHW) na hemijski sastav drvnog iverja. in Advanced Technologies. 2022;11(2):40-47.
doi:10.5937/savteh2202040D
conv_795 .

Drpić, Aleksandar D., Popović, Jasmina, Popović, Mlađan, Điporović-Momčilović, Milanka, "Analiza uticaja predtretmana vrelom vodom (LHW) na hemijski sastav drvnog iverja" in Advanced Technologies, 11, no. 2 (2022):40-47,
https://doi.org/10.5937/savteh2202040D .,
conv_795 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Vukić, Nevena
AU  - Điporović-Momčilović, Milanka
AU  - Budinski-Simendić, Jaroslava
AU  - Gavrilović-Grmuša, Ivana
AU  - Popović, Jasmina
AU  - Ristić, Ivan
PY  - 2022
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1346
AB  - Addition of poly(diallyldimethylammonium chloride) (PDDA) on the performances of ureaformaldehyde (UF) adhesives was evaluated in this work. Three types of UF adhesives were prepared, one without PDDA addition, and two types with PDDA addition of 1 and 3 wt.% per dry UF adhesive mass. These UF adhesive systems were used for producing experimental particleboard panels. The addition of PDDA decreased the thickness swelling of the panel samples, while the internal bond of the particleboards increased significantly only at the highest PDDA content (3 wt.%). Differential scanning calorimetry (DSC) was applied to address the influence of PDDA on UF adhesive curing kinetics. DSC scans were performed in non-isothermal regimes using different heating rates (5, 10, and 20 degrees C.min(-1)). The activation energy (Ea) of the curing reaction showed slightly lower values for the UF adhesive systems containing PDDA. However, the peak temperatures and enthalpy of reaction did not change significantly. The Kissinger-Akahira-Sunose and Friedman iso-conversional methods were applied to investigate the effects of PDDA addition on the UF adhesive curing process.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Effects of Poly(diallyldimethylammonium chloride) addition on the curing kinetics of urea-formaldehyde adhesives for particleboards
EP  - 28
IS  - 1
SP  - 19
VL  - 76
DO  - 10.2298/HEMIND210914001P
UR  - conv_1618
ER  - 

@article{
author = "Popović, Mlađan and Vukić, Nevena and Điporović-Momčilović, Milanka and Budinski-Simendić, Jaroslava and Gavrilović-Grmuša, Ivana and Popović, Jasmina and Ristić, Ivan",
year = "2022",
abstract = "Addition of poly(diallyldimethylammonium chloride) (PDDA) on the performances of ureaformaldehyde (UF) adhesives was evaluated in this work. Three types of UF adhesives were prepared, one without PDDA addition, and two types with PDDA addition of 1 and 3 wt.% per dry UF adhesive mass. These UF adhesive systems were used for producing experimental particleboard panels. The addition of PDDA decreased the thickness swelling of the panel samples, while the internal bond of the particleboards increased significantly only at the highest PDDA content (3 wt.%). Differential scanning calorimetry (DSC) was applied to address the influence of PDDA on UF adhesive curing kinetics. DSC scans were performed in non-isothermal regimes using different heating rates (5, 10, and 20 degrees C.min(-1)). The activation energy (Ea) of the curing reaction showed slightly lower values for the UF adhesive systems containing PDDA. However, the peak temperatures and enthalpy of reaction did not change significantly. The Kissinger-Akahira-Sunose and Friedman iso-conversional methods were applied to investigate the effects of PDDA addition on the UF adhesive curing process.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Effects of Poly(diallyldimethylammonium chloride) addition on the curing kinetics of urea-formaldehyde adhesives for particleboards",
pages = "28-19",
number = "1",
volume = "76",
doi = "10.2298/HEMIND210914001P",
url = "conv_1618"
}

Popović, M., Vukić, N., Điporović-Momčilović, M., Budinski-Simendić, J., Gavrilović-Grmuša, I., Popović, J.,& Ristić, I.. (2022). Effects of Poly(diallyldimethylammonium chloride) addition on the curing kinetics of urea-formaldehyde adhesives for particleboards. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 76(1), 19-28.
https://doi.org/10.2298/HEMIND210914001P
conv_1618

Popović M, Vukić N, Điporović-Momčilović M, Budinski-Simendić J, Gavrilović-Grmuša I, Popović J, Ristić I. Effects of Poly(diallyldimethylammonium chloride) addition on the curing kinetics of urea-formaldehyde adhesives for particleboards. in Hemijska industrija. 2022;76(1):19-28.
doi:10.2298/HEMIND210914001P
conv_1618 .

Popović, Mlađan, Vukić, Nevena, Điporović-Momčilović, Milanka, Budinski-Simendić, Jaroslava, Gavrilović-Grmuša, Ivana, Popović, Jasmina, Ristić, Ivan, "Effects of Poly(diallyldimethylammonium chloride) addition on the curing kinetics of urea-formaldehyde adhesives for particleboards" in Hemijska industrija, 76, no. 1 (2022):19-28,
https://doi.org/10.2298/HEMIND210914001P .,
conv_1618 .

TY  - JOUR
AU  - Popović, Jasmina
AU  - Svrzić, Srđan
AU  - Gajić, Milica
AU  - Maletić, Slavica
AU  - Dodevski, Vladimir
AU  - Điporović-Momčilović, Milanka
AU  - Krstić, Sanja
AU  - Popović, Mlađan
PY  - 2022
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1359
AB  - There is an increased research interest in methods for transparent wood production and its use. Wood transparency could be achieved by its delignification followed by an impregnation process with polymers having proper optical properties. However, delignification processes are mainly time consuming and not environmentally friendly. The possibility of treating mahogany wood (Swietenia macrophylla King) with 20% hydrogen peroxide for 70, 100, 135, and 170 min at 103 degrees C is presented in this research. According to the treatment duration, lignin content decreased 40 to 94% relative to its initial content in the control samples, whilst the cell structure remained intact. Due to the light scatter effect, caused mainly by wood tissue structure, the direct optical transmittance of treated samples in the visible light spectrum (400 to 800 nm) was less than 40%. Simultaneously, the total optical transmittance of samples treated for 100 and 135 min reached values between 70 to 80% with high values of the haze at approximately 30 and 60%. Optical transmittance in the visible spectrum area of the samples treated for 170 min was from 45 to 80% and the haze from 25 to 45%.
T2  - BioResources
T1  - Light Transmittance of Mahogany Wood Treated with 20% Hydrogen Peroxide Solution
EP  - 5935
IS  - 4
SP  - 5919
VL  - 17
DO  - 10.15376/biores.17.4.5919-5935
UR  - conv_1670
ER  - 

@article{
author = "Popović, Jasmina and Svrzić, Srđan and Gajić, Milica and Maletić, Slavica and Dodevski, Vladimir and Điporović-Momčilović, Milanka and Krstić, Sanja and Popović, Mlađan",
year = "2022",
abstract = "There is an increased research interest in methods for transparent wood production and its use. Wood transparency could be achieved by its delignification followed by an impregnation process with polymers having proper optical properties. However, delignification processes are mainly time consuming and not environmentally friendly. The possibility of treating mahogany wood (Swietenia macrophylla King) with 20% hydrogen peroxide for 70, 100, 135, and 170 min at 103 degrees C is presented in this research. According to the treatment duration, lignin content decreased 40 to 94% relative to its initial content in the control samples, whilst the cell structure remained intact. Due to the light scatter effect, caused mainly by wood tissue structure, the direct optical transmittance of treated samples in the visible light spectrum (400 to 800 nm) was less than 40%. Simultaneously, the total optical transmittance of samples treated for 100 and 135 min reached values between 70 to 80% with high values of the haze at approximately 30 and 60%. Optical transmittance in the visible spectrum area of the samples treated for 170 min was from 45 to 80% and the haze from 25 to 45%.",
journal = "BioResources",
title = "Light Transmittance of Mahogany Wood Treated with 20% Hydrogen Peroxide Solution",
pages = "5935-5919",
number = "4",
volume = "17",
doi = "10.15376/biores.17.4.5919-5935",
url = "conv_1670"
}

Popović, J., Svrzić, S., Gajić, M., Maletić, S., Dodevski, V., Điporović-Momčilović, M., Krstić, S.,& Popović, M.. (2022). Light Transmittance of Mahogany Wood Treated with 20% Hydrogen Peroxide Solution. in BioResources, 17(4), 5919-5935.
https://doi.org/10.15376/biores.17.4.5919-5935
conv_1670

Popović J, Svrzić S, Gajić M, Maletić S, Dodevski V, Điporović-Momčilović M, Krstić S, Popović M. Light Transmittance of Mahogany Wood Treated with 20% Hydrogen Peroxide Solution. in BioResources. 2022;17(4):5919-5935.
doi:10.15376/biores.17.4.5919-5935
conv_1670 .

Popović, Jasmina, Svrzić, Srđan, Gajić, Milica, Maletić, Slavica, Dodevski, Vladimir, Điporović-Momčilović, Milanka, Krstić, Sanja, Popović, Mlađan, "Light Transmittance of Mahogany Wood Treated with 20% Hydrogen Peroxide Solution" in BioResources, 17, no. 4 (2022):5919-5935,
https://doi.org/10.15376/biores.17.4.5919-5935 .,
conv_1670 .

TY  - JOUR
AU  - Popović, Jasmina
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
AU  - Prahin, Ana M.
AU  - Dodevski, Vladimir M.
AU  - Gavrilović-Grmuša, Ivana
PY  - 2021
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1209
AB  - Particles of beech wood were treated with hot water at the temperature of 150 degrees C, during 60 min, prior to the pelleting process. The applied hot water pretreatment affected the chemical composition and heating value of particles. Two groups of pellets, designated as PT 10 and PT 20, were produced from treated beech particles, with the moisture content of particles being 10.5 and 20.5 %, respectively. Pellets from nontreated beech particles (PNT) served as controls to assess the hot water pretreatment effects on the pellet properties. Both, the applied pretreatment, and the particle moisture content, affected properties of the obtained pellets. The heating value of PT 10 ad PT 20 pellets has increased for similar to 6 and 1 %, respectively. The mineral (ash) content in treated pellets decreased for about 24 % in comparison to that in PNT pellets. In addition, the bulk (apparent) density of pellets has increased for 21 % (PT 10) and 10 % (PT 20), as a consequence of the hot water pretreatment of particles. The specific density of PT 10 pellets was for 16 % higher, while the equilibrium moisture content (after conditioning at RH 68 % and 20.1 degrees C) was for about 32 % lower in comparison to the respective properties of PNT pellets.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Effects of water pretreatment on properties of pellets made from beech particles
EP  - 51
IS  - 1
SP  - 39
VL  - 75
DO  - 10.2298/HEMIN191224007P
UR  - conv_1529
ER  - 

@article{
author = "Popović, Jasmina and Popović, Mlađan and Điporović-Momčilović, Milanka and Prahin, Ana M. and Dodevski, Vladimir M. and Gavrilović-Grmuša, Ivana",
year = "2021",
abstract = "Particles of beech wood were treated with hot water at the temperature of 150 degrees C, during 60 min, prior to the pelleting process. The applied hot water pretreatment affected the chemical composition and heating value of particles. Two groups of pellets, designated as PT 10 and PT 20, were produced from treated beech particles, with the moisture content of particles being 10.5 and 20.5 %, respectively. Pellets from nontreated beech particles (PNT) served as controls to assess the hot water pretreatment effects on the pellet properties. Both, the applied pretreatment, and the particle moisture content, affected properties of the obtained pellets. The heating value of PT 10 ad PT 20 pellets has increased for similar to 6 and 1 %, respectively. The mineral (ash) content in treated pellets decreased for about 24 % in comparison to that in PNT pellets. In addition, the bulk (apparent) density of pellets has increased for 21 % (PT 10) and 10 % (PT 20), as a consequence of the hot water pretreatment of particles. The specific density of PT 10 pellets was for 16 % higher, while the equilibrium moisture content (after conditioning at RH 68 % and 20.1 degrees C) was for about 32 % lower in comparison to the respective properties of PNT pellets.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Effects of water pretreatment on properties of pellets made from beech particles",
pages = "51-39",
number = "1",
volume = "75",
doi = "10.2298/HEMIN191224007P",
url = "conv_1529"
}

Popović, J., Popović, M., Điporović-Momčilović, M., Prahin, A. M., Dodevski, V. M.,& Gavrilović-Grmuša, I.. (2021). Effects of water pretreatment on properties of pellets made from beech particles. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 75(1), 39-51.
https://doi.org/10.2298/HEMIN191224007P
conv_1529

Popović J, Popović M, Điporović-Momčilović M, Prahin AM, Dodevski VM, Gavrilović-Grmuša I. Effects of water pretreatment on properties of pellets made from beech particles. in Hemijska industrija. 2021;75(1):39-51.
doi:10.2298/HEMIN191224007P
conv_1529 .

Popović, Jasmina, Popović, Mlađan, Điporović-Momčilović, Milanka, Prahin, Ana M., Dodevski, Vladimir M., Gavrilović-Grmuša, Ivana, "Effects of water pretreatment on properties of pellets made from beech particles" in Hemijska industrija, 75, no. 1 (2021):39-51,
https://doi.org/10.2298/HEMIN191224007P .,
conv_1529 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
AU  - Gavrilović-Grmuša, Ivana
PY  - 2020
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1162
AB  - Urea-formaldehidni (UF) adheziv je još uvek jedan od najvažnijih adhezivnih sistema u proizvodnji ploča iverica i ploča vlaknatica srednje gustine (MDF). Međutim, nameštaj i elementi enterijera koji sadrže ove proizvode predstavljaju jedan od izvora emisije formaldehida u unutrašnjem prostoru. Prepoznavanje formaldehida kao supstance štetne po zdravlje čoveka imalo je snažan uticaj na sektor proizvodnje ploča na bazi drveta, pošto su se ovi proizvodi našli pod ograničenjima od strane brojnih nacionalnih i međunarodnih regulativa. Shodno tome, ovaj rad predstavlja pregled standarda i regulativa koji danas definišu emisione granice za ploče na bazi drveta, a od značaja su za tržište ovih ploča u Republici Srbiji. Ovde se, takođe, daje i kratak pregled metoda i procedura u proizvodnji ploča na bazi drveta sa veoma niskom ili bez emisije formaldehida.
AB  - The urea-formaldehyde (UF) adhesive is still most important adhesive system in the production of interior grade particleboards and medium density fibreboards (MDF). However, the furniture and interior fitments, incorporating these products, present one of the sources of formaldehyde emission into the indoor air. The recognition of formaldehyde as a substance that presents the risk for a human health had a strong impact on wood-based panels industry, as it came under constrains by the number of national and international regulations. Hence, this paper presents the overview of standards and regulations that define formaldehyde emission limits for wood-based panels today, and of a special interest for a wood-based panels market in the Republic of Serbia. The paper also gives an overview on a possible methods and procedures for the production of wood-based panels with low or no formaldehyde emission.
PB  - Inženjersko društvo za koroziju, Beograd
T2  - Zaštita materijala
T1  - Savremeni standardi i propisi o emisiji formaldehida iz kompozitnih ploča od drveta
T1  - New standards and regulations on formaldehyde emission from wood-based composite panels
EP  - 160
IS  - 2
SP  - 152
VL  - 61
DO  - 10.5937/zasmat2002152P
UR  - conv_66
ER  - 

@article{
author = "Popović, Mlađan and Điporović-Momčilović, Milanka and Gavrilović-Grmuša, Ivana",
year = "2020",
abstract = "Urea-formaldehidni (UF) adheziv je još uvek jedan od najvažnijih adhezivnih sistema u proizvodnji ploča iverica i ploča vlaknatica srednje gustine (MDF). Međutim, nameštaj i elementi enterijera koji sadrže ove proizvode predstavljaju jedan od izvora emisije formaldehida u unutrašnjem prostoru. Prepoznavanje formaldehida kao supstance štetne po zdravlje čoveka imalo je snažan uticaj na sektor proizvodnje ploča na bazi drveta, pošto su se ovi proizvodi našli pod ograničenjima od strane brojnih nacionalnih i međunarodnih regulativa. Shodno tome, ovaj rad predstavlja pregled standarda i regulativa koji danas definišu emisione granice za ploče na bazi drveta, a od značaja su za tržište ovih ploča u Republici Srbiji. Ovde se, takođe, daje i kratak pregled metoda i procedura u proizvodnji ploča na bazi drveta sa veoma niskom ili bez emisije formaldehida., The urea-formaldehyde (UF) adhesive is still most important adhesive system in the production of interior grade particleboards and medium density fibreboards (MDF). However, the furniture and interior fitments, incorporating these products, present one of the sources of formaldehyde emission into the indoor air. The recognition of formaldehyde as a substance that presents the risk for a human health had a strong impact on wood-based panels industry, as it came under constrains by the number of national and international regulations. Hence, this paper presents the overview of standards and regulations that define formaldehyde emission limits for wood-based panels today, and of a special interest for a wood-based panels market in the Republic of Serbia. The paper also gives an overview on a possible methods and procedures for the production of wood-based panels with low or no formaldehyde emission.",
publisher = "Inženjersko društvo za koroziju, Beograd",
journal = "Zaštita materijala",
title = "Savremeni standardi i propisi o emisiji formaldehida iz kompozitnih ploča od drveta, New standards and regulations on formaldehyde emission from wood-based composite panels",
pages = "160-152",
number = "2",
volume = "61",
doi = "10.5937/zasmat2002152P",
url = "conv_66"
}

Popović, M., Điporović-Momčilović, M.,& Gavrilović-Grmuša, I.. (2020). Savremeni standardi i propisi o emisiji formaldehida iz kompozitnih ploča od drveta. in Zaštita materijala
Inženjersko društvo za koroziju, Beograd., 61(2), 152-160.
https://doi.org/10.5937/zasmat2002152P
conv_66

Popović M, Điporović-Momčilović M, Gavrilović-Grmuša I. Savremeni standardi i propisi o emisiji formaldehida iz kompozitnih ploča od drveta. in Zaštita materijala. 2020;61(2):152-160.
doi:10.5937/zasmat2002152P
conv_66 .

Popović, Mlađan, Điporović-Momčilović, Milanka, Gavrilović-Grmuša, Ivana, "Savremeni standardi i propisi o emisiji formaldehida iz kompozitnih ploča od drveta" in Zaštita materijala, 61, no. 2 (2020):152-160,
https://doi.org/10.5937/zasmat2002152P .,
conv_66 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Popović, Jasmina
AU  - Điporović-Momčilović, Milanka
AU  - Vukić, Nevena
AU  - Budinski-Simendić, Jaroslava
AU  - Gavrilović-Grmuša, Ivana
AU  - Hamid, Fadhil
PY  - 2019
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1040
AB  - U ovom radu istraživan je uticaj pred-tretmana poljskog jasena (Fraxinus angustifolia Vahl. ssp. Pannonica Soo & Simon) na tok očvršćavanja urea-formaldehidnog (UF) adheziva. Metoda diferecijalne skenirajuće kalorimetrije (DSC) korišćena je za praćenje reakcije očvršćavanja UF adheziva u smeši sa netretiranim drvnim brašnom (kontrolna serija) i drvnim brašnom dobijenim od različito tretiranog iverja poljskog jasena. Primenjena su tri različita pred-tretmana: tretman rastvorom natrijum karbonata (0,03 g/g apsolutno suvog drveta), tretman rastvorom sirćetne kiseline (0,06 g/g apsolutno suvog drveta) i tretman destilovanom vodom. Rezultati praćenja očvršćavanja različitih adhezivnih sistema nisu ukazali na značajne razlike u temperaturama maksimuma reakcije, kao niti u vrednostima entalpije reakcije. Međutim, relativno niže vrednosti energije aktivacije uočene su kod UF adhezivnih sistema sa drvnim brašnom dobijenim nakon alkalnog i kiselog tretmana (76,64 and 76,92 kJ/mol) u odnosu na UF adhezive sa kontrolnim (netretiranim) drvnim brašnom i drvnim brašnom tretiranim vodom (79,28 and 79,14 kJ/mol). Pored toga, primenjene izo-konverzione metode pokazale su različito ponašanje ispitivanih UF adhezivnih sistema tokom očvršćavanja.
AB  - The influence of Narrow Leaved Ash (Fraxinus angustifolia Vahl. ssp. Pannonica Soo & Simon) pre-treatments on the curing behavior of urea-formaldehyde (UF) adhesive was studied. Differential scanning calorimetry (DSC) was used to monitor the curing reaction of UF adhesive mixed with non-treated wood flour (control series) and wood flour of Narrow leaved Ash obtained after different pre-treatments of wood particles. Three different pre-treatments were applied, one with sodium carbonate solution (0.03 g/g of dry wood), one with acetic acid solution (0.06 g/g of dry wood) and one with distilled water. The curing reaction of different adhesive systems showed no apparent differences in peak temperature values, and there were no significant differences in the enthalpy of the reaction. However, it was assessed that the activation energy has lower values for the UF systems with alkaline and acid treated wood flour (76.64 and 76.92 kJ/mol) in regard to the UF systems with control (untreated) wood flour and water treated wood flour (79.28 and 79.14 kJ/mol). In addition, the application of iso-conversional models have shown different curing behavior of UF adhesive systems.
PB  - Inženjersko društvo za koroziju, Beograd
T2  - Materials Protection
T1  - Očvršćavanje urea-formaldehidnog adheziva u prisustvu hemijski tretiranog drveta poljskog jasena
T1  - The curing behavior of urea-formaldehyde adhesive in the presence of chemically treated narrow-leaved ash
EP  - 69
IS  - 1
SP  - 64
VL  - 60
DO  - 10.5937/zasmat1901064P
UR  - conv_2004
ER  - 

@article{
author = "Popović, Mlađan and Popović, Jasmina and Điporović-Momčilović, Milanka and Vukić, Nevena and Budinski-Simendić, Jaroslava and Gavrilović-Grmuša, Ivana and Hamid, Fadhil",
year = "2019",
abstract = "U ovom radu istraživan je uticaj pred-tretmana poljskog jasena (Fraxinus angustifolia Vahl. ssp. Pannonica Soo & Simon) na tok očvršćavanja urea-formaldehidnog (UF) adheziva. Metoda diferecijalne skenirajuće kalorimetrije (DSC) korišćena je za praćenje reakcije očvršćavanja UF adheziva u smeši sa netretiranim drvnim brašnom (kontrolna serija) i drvnim brašnom dobijenim od različito tretiranog iverja poljskog jasena. Primenjena su tri različita pred-tretmana: tretman rastvorom natrijum karbonata (0,03 g/g apsolutno suvog drveta), tretman rastvorom sirćetne kiseline (0,06 g/g apsolutno suvog drveta) i tretman destilovanom vodom. Rezultati praćenja očvršćavanja različitih adhezivnih sistema nisu ukazali na značajne razlike u temperaturama maksimuma reakcije, kao niti u vrednostima entalpije reakcije. Međutim, relativno niže vrednosti energije aktivacije uočene su kod UF adhezivnih sistema sa drvnim brašnom dobijenim nakon alkalnog i kiselog tretmana (76,64 and 76,92 kJ/mol) u odnosu na UF adhezive sa kontrolnim (netretiranim) drvnim brašnom i drvnim brašnom tretiranim vodom (79,28 and 79,14 kJ/mol). Pored toga, primenjene izo-konverzione metode pokazale su različito ponašanje ispitivanih UF adhezivnih sistema tokom očvršćavanja., The influence of Narrow Leaved Ash (Fraxinus angustifolia Vahl. ssp. Pannonica Soo & Simon) pre-treatments on the curing behavior of urea-formaldehyde (UF) adhesive was studied. Differential scanning calorimetry (DSC) was used to monitor the curing reaction of UF adhesive mixed with non-treated wood flour (control series) and wood flour of Narrow leaved Ash obtained after different pre-treatments of wood particles. Three different pre-treatments were applied, one with sodium carbonate solution (0.03 g/g of dry wood), one with acetic acid solution (0.06 g/g of dry wood) and one with distilled water. The curing reaction of different adhesive systems showed no apparent differences in peak temperature values, and there were no significant differences in the enthalpy of the reaction. However, it was assessed that the activation energy has lower values for the UF systems with alkaline and acid treated wood flour (76.64 and 76.92 kJ/mol) in regard to the UF systems with control (untreated) wood flour and water treated wood flour (79.28 and 79.14 kJ/mol). In addition, the application of iso-conversional models have shown different curing behavior of UF adhesive systems.",
publisher = "Inženjersko društvo za koroziju, Beograd",
journal = "Materials Protection",
title = "Očvršćavanje urea-formaldehidnog adheziva u prisustvu hemijski tretiranog drveta poljskog jasena, The curing behavior of urea-formaldehyde adhesive in the presence of chemically treated narrow-leaved ash",
pages = "69-64",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901064P",
url = "conv_2004"
}

Popović, M., Popović, J., Điporović-Momčilović, M., Vukić, N., Budinski-Simendić, J., Gavrilović-Grmuša, I.,& Hamid, F.. (2019). Očvršćavanje urea-formaldehidnog adheziva u prisustvu hemijski tretiranog drveta poljskog jasena. in Materials Protection
Inženjersko društvo za koroziju, Beograd., 60(1), 64-69.
https://doi.org/10.5937/zasmat1901064P
conv_2004

Popović M, Popović J, Điporović-Momčilović M, Vukić N, Budinski-Simendić J, Gavrilović-Grmuša I, Hamid F. Očvršćavanje urea-formaldehidnog adheziva u prisustvu hemijski tretiranog drveta poljskog jasena. in Materials Protection. 2019;60(1):64-69.
doi:10.5937/zasmat1901064P
conv_2004 .

Popović, Mlađan, Popović, Jasmina, Điporović-Momčilović, Milanka, Vukić, Nevena, Budinski-Simendić, Jaroslava, Gavrilović-Grmuša, Ivana, Hamid, Fadhil, "Očvršćavanje urea-formaldehidnog adheziva u prisustvu hemijski tretiranog drveta poljskog jasena" in Materials Protection, 60, no. 1 (2019):64-69,
https://doi.org/10.5937/zasmat1901064P .,
conv_2004 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Todorović, Tijana
AU  - Điporović-Momčilović, Milanka
AU  - Gavrilović-Grmuša, Ivana
AU  - Popović, Jasmina
PY  - 2018
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/931
AB  - The formaldehyde release and the formaldehyde content from the commercial
   particleboards were determined using the flask and perforator methods. Since
   the melamine faced boards were used in this research, the flask method was
   applied to evaluate how much the decorative surface (melamine impregnated
   paper) affects the test results in terms of reducing the formaldehyde
   emission from the samples. Hence, the flask method tests were performed
   simultaneously with one test series presenting the melamine faced samples,
   and the other one presenting the samples with sanded surface. Also, the
   decorative surface was sanded off from all of the test samples intended for
   formaldehyde content measurements using perforator method. During this
   research, it was found that by removing the decorative surface, the
   formaldehyde emission increased in the range from 12.6% to 16.6%, suggesting
   that the decorative surface acts as a barrier to formaldehyde emission even
   for the samples of such a small size used in the flask method. In addition,
   very high correlation, of 0,989 and 0,959, was found between the
   formaldehyde content values (perforator method) and the values of
   formaldehyde release from sanded and melamine faced samples, respectively.
PB  - Univerzitet u Beogradu - Šumarski fakultet, Beograd
T2  - Glasnik Šumarskog Fakulteta: Univerzitet u Beogradu
T1  - The influence of decorative surface of commercial particleboards on the formaldehyde release measured by flask method
EP  - 142
IS  - 117
SP  - 137
VL  - 2018
DO  - 10.2298/GSF1817137P
UR  - conv_2326
ER  - 

@article{
author = "Popović, Mlađan and Todorović, Tijana and Điporović-Momčilović, Milanka and Gavrilović-Grmuša, Ivana and Popović, Jasmina",
year = "2018",
abstract = "The formaldehyde release and the formaldehyde content from the commercial
   particleboards were determined using the flask and perforator methods. Since
   the melamine faced boards were used in this research, the flask method was
   applied to evaluate how much the decorative surface (melamine impregnated
   paper) affects the test results in terms of reducing the formaldehyde
   emission from the samples. Hence, the flask method tests were performed
   simultaneously with one test series presenting the melamine faced samples,
   and the other one presenting the samples with sanded surface. Also, the
   decorative surface was sanded off from all of the test samples intended for
   formaldehyde content measurements using perforator method. During this
   research, it was found that by removing the decorative surface, the
   formaldehyde emission increased in the range from 12.6% to 16.6%, suggesting
   that the decorative surface acts as a barrier to formaldehyde emission even
   for the samples of such a small size used in the flask method. In addition,
   very high correlation, of 0,989 and 0,959, was found between the
   formaldehyde content values (perforator method) and the values of
   formaldehyde release from sanded and melamine faced samples, respectively.",
publisher = "Univerzitet u Beogradu - Šumarski fakultet, Beograd",
journal = "Glasnik Šumarskog Fakulteta: Univerzitet u Beogradu",
title = "The influence of decorative surface of commercial particleboards on the formaldehyde release measured by flask method",
pages = "142-137",
number = "117",
volume = "2018",
doi = "10.2298/GSF1817137P",
url = "conv_2326"
}

Popović, M., Todorović, T., Điporović-Momčilović, M., Gavrilović-Grmuša, I.,& Popović, J.. (2018). The influence of decorative surface of commercial particleboards on the formaldehyde release measured by flask method. in Glasnik Šumarskog Fakulteta: Univerzitet u Beogradu
Univerzitet u Beogradu - Šumarski fakultet, Beograd., 2018(117), 137-142.
https://doi.org/10.2298/GSF1817137P
conv_2326

Popović M, Todorović T, Điporović-Momčilović M, Gavrilović-Grmuša I, Popović J. The influence of decorative surface of commercial particleboards on the formaldehyde release measured by flask method. in Glasnik Šumarskog Fakulteta: Univerzitet u Beogradu. 2018;2018(117):137-142.
doi:10.2298/GSF1817137P
conv_2326 .

Popović, Mlađan, Todorović, Tijana, Điporović-Momčilović, Milanka, Gavrilović-Grmuša, Ivana, Popović, Jasmina, "The influence of decorative surface of commercial particleboards on the formaldehyde release measured by flask method" in Glasnik Šumarskog Fakulteta: Univerzitet u Beogradu, 2018, no. 117 (2018):137-142,
https://doi.org/10.2298/GSF1817137P .,
conv_2326 .

TY  - JOUR
AU  - Điporović-Momčilović, Milanka
AU  - Popović, Mlađan
AU  - Popović, Jasmina
AU  - Gavrilović-Grmuša, Ivana
AU  - Hamid, Fadhil
AU  - Hakky-Mohamad, Ahmad
PY  - 2018
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/966
AB  - U ovom radu istražen je trend kretanja emisije formaldehida iz ploča iverica uvezenih na tržište Srbije. Uzorkovanje i ispitivanje ploča iverica obavljeno je u dva vremenski odvojena perioda. Prvi period ispitivanja odvijao se tokom 2011. godine, a drugi tokom 2015-2016. godine. U oba ova perioda, uzorkovane su sirove ploče iverice, poreklom od tri različita proizvođača. Perforator metoda (EN 120) korišćena je za ispitivanje sadržaja formaldehida u uzorcima ploča. Rezultati pomenutih ispitivanja pokazali su da velika većina uzoraka pripada E1 klasi ploča iverica. Pored toga, oko 19 % ploča iverica uzorkovanih u 2011. godini i oko 31 % ploča uzorkovanih tokom perioda 2015-2016. godine imali su sadržaj formaldehida ispod 50 % od zahteva za E1 klasom.
AB  - The formaldehyde potential of particleboards imported on Serbian market was evaluated in this research. The sampling and testing of particleboards were conducted in two discrete periods: first was during 2011 and the second was in the period of 2015-2016. For both periods, the samples of raw particleboards originated from three different producers. The perforator method (EN 120) was used to test the formaldehyde content in the particleboard samples. In general, the results have showed that the majority of the samples belong to the E1 class of particleboards. In addition, 19 % of the particleboards sampled in 2011 and 31 % of the boards sampled in 2015-2016 were found to have formaldehyde content below 50 % of E1 class requirements.
PB  - Inženjersko društvo za koroziju, Beograd
T2  - Zaštita materijala
T1  - Kvalitet ploča iverica na tržištu Srbije u pogledu emisije formaldehida
T1  - Quality of the particleboards on Serbian market in regard to the formaldehyde emission
EP  - 488
IS  - 4
SP  - 484
VL  - 59
DO  - 10.5937/zasmat1804484D
UR  - conv_63
ER  - 

@article{
author = "Điporović-Momčilović, Milanka and Popović, Mlađan and Popović, Jasmina and Gavrilović-Grmuša, Ivana and Hamid, Fadhil and Hakky-Mohamad, Ahmad",
year = "2018",
abstract = "U ovom radu istražen je trend kretanja emisije formaldehida iz ploča iverica uvezenih na tržište Srbije. Uzorkovanje i ispitivanje ploča iverica obavljeno je u dva vremenski odvojena perioda. Prvi period ispitivanja odvijao se tokom 2011. godine, a drugi tokom 2015-2016. godine. U oba ova perioda, uzorkovane su sirove ploče iverice, poreklom od tri različita proizvođača. Perforator metoda (EN 120) korišćena je za ispitivanje sadržaja formaldehida u uzorcima ploča. Rezultati pomenutih ispitivanja pokazali su da velika većina uzoraka pripada E1 klasi ploča iverica. Pored toga, oko 19 % ploča iverica uzorkovanih u 2011. godini i oko 31 % ploča uzorkovanih tokom perioda 2015-2016. godine imali su sadržaj formaldehida ispod 50 % od zahteva za E1 klasom., The formaldehyde potential of particleboards imported on Serbian market was evaluated in this research. The sampling and testing of particleboards were conducted in two discrete periods: first was during 2011 and the second was in the period of 2015-2016. For both periods, the samples of raw particleboards originated from three different producers. The perforator method (EN 120) was used to test the formaldehyde content in the particleboard samples. In general, the results have showed that the majority of the samples belong to the E1 class of particleboards. In addition, 19 % of the particleboards sampled in 2011 and 31 % of the boards sampled in 2015-2016 were found to have formaldehyde content below 50 % of E1 class requirements.",
publisher = "Inženjersko društvo za koroziju, Beograd",
journal = "Zaštita materijala",
title = "Kvalitet ploča iverica na tržištu Srbije u pogledu emisije formaldehida, Quality of the particleboards on Serbian market in regard to the formaldehyde emission",
pages = "488-484",
number = "4",
volume = "59",
doi = "10.5937/zasmat1804484D",
url = "conv_63"
}

Điporović-Momčilović, M., Popović, M., Popović, J., Gavrilović-Grmuša, I., Hamid, F.,& Hakky-Mohamad, A.. (2018). Kvalitet ploča iverica na tržištu Srbije u pogledu emisije formaldehida. in Zaštita materijala
Inženjersko društvo za koroziju, Beograd., 59(4), 484-488.
https://doi.org/10.5937/zasmat1804484D
conv_63

Điporović-Momčilović M, Popović M, Popović J, Gavrilović-Grmuša I, Hamid F, Hakky-Mohamad A. Kvalitet ploča iverica na tržištu Srbije u pogledu emisije formaldehida. in Zaštita materijala. 2018;59(4):484-488.
doi:10.5937/zasmat1804484D
conv_63 .

Điporović-Momčilović, Milanka, Popović, Mlađan, Popović, Jasmina, Gavrilović-Grmuša, Ivana, Hamid, Fadhil, Hakky-Mohamad, Ahmad, "Kvalitet ploča iverica na tržištu Srbije u pogledu emisije formaldehida" in Zaštita materijala, 59, no. 4 (2018):484-488,
https://doi.org/10.5937/zasmat1804484D .,
conv_63 .

TY  - CONF
AU  - Điporović-Momčilović, Milanka
AU  - Popović, Mlađan
AU  - Gavrilović-Grmuša, Ivana
AU  - Popović, Jasmina
AU  - Mohamad, Ahmad Hakky
PY  - 2018
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/971
AB  - Wood composite panels produced with formaldehyde-based resins present one of the major sources of formaldehyde emissions in the interior. This problem has become publicly recognized during 1970ies, and since then the significant efforts were addressed to control the formaldehyde emission from wood-based panels. The European and USA regulations on this subject have led to further improvements in the resin development, and to the technology of wood based panels in a broader aspect. Today, the regulations in Serbia concerning the formaldehyde emission standards are based on the accepted European standards, and the same applies to the testing methods. The capacities for testing the wood based panels on the free formaldehyde were developed in Serbia during the 1980ies, firstly at the Faculty of Forestry of the Belgrade University. The analysis of existing capacities for formaldehyde testing in Serbia is given in this paper, as well as the possibilities for further improvements in this field.
PB  - WoodEMA, i.a.
C3  - Increasing the Use of Wood in the Global Bio-Economy - Proceedings of Scientific Papers
T1  - Formaldehyde emission standards for wood-based panels and testing capacities in Serbia
EP  - 333
SP  - 323
UR  - conv_2049
ER  - 

@conference{
author = "Điporović-Momčilović, Milanka and Popović, Mlađan and Gavrilović-Grmuša, Ivana and Popović, Jasmina and Mohamad, Ahmad Hakky",
year = "2018",
abstract = "Wood composite panels produced with formaldehyde-based resins present one of the major sources of formaldehyde emissions in the interior. This problem has become publicly recognized during 1970ies, and since then the significant efforts were addressed to control the formaldehyde emission from wood-based panels. The European and USA regulations on this subject have led to further improvements in the resin development, and to the technology of wood based panels in a broader aspect. Today, the regulations in Serbia concerning the formaldehyde emission standards are based on the accepted European standards, and the same applies to the testing methods. The capacities for testing the wood based panels on the free formaldehyde were developed in Serbia during the 1980ies, firstly at the Faculty of Forestry of the Belgrade University. The analysis of existing capacities for formaldehyde testing in Serbia is given in this paper, as well as the possibilities for further improvements in this field.",
publisher = "WoodEMA, i.a.",
journal = "Increasing the Use of Wood in the Global Bio-Economy - Proceedings of Scientific Papers",
title = "Formaldehyde emission standards for wood-based panels and testing capacities in Serbia",
pages = "333-323",
url = "conv_2049"
}

Điporović-Momčilović, M., Popović, M., Gavrilović-Grmuša, I., Popović, J.,& Mohamad, A. H.. (2018). Formaldehyde emission standards for wood-based panels and testing capacities in Serbia. in Increasing the Use of Wood in the Global Bio-Economy - Proceedings of Scientific Papers
WoodEMA, i.a.., 323-333.
conv_2049

Điporović-Momčilović M, Popović M, Gavrilović-Grmuša I, Popović J, Mohamad AH. Formaldehyde emission standards for wood-based panels and testing capacities in Serbia. in Increasing the Use of Wood in the Global Bio-Economy - Proceedings of Scientific Papers. 2018;:323-333.
conv_2049 .

Điporović-Momčilović, Milanka, Popović, Mlađan, Gavrilović-Grmuša, Ivana, Popović, Jasmina, Mohamad, Ahmad Hakky, "Formaldehyde emission standards for wood-based panels and testing capacities in Serbia" in Increasing the Use of Wood in the Global Bio-Economy - Proceedings of Scientific Papers (2018):323-333,
conv_2049 .

TY  - JOUR
AU  - Budinski, Natalija
AU  - Jovičić, Mirjana
AU  - Vukić, Nevena
AU  - Popović, Mlađan
PY  - 2017
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/870
AB  - We report a new educational approach for teaching students about contemporary Materials Science and Engineering (MSE) research. It describes how MSE can be introduced to high school students as examples for analysis in mathematical classes. We discuss, in this example, how such students are introduced to MSE materials preparation experiments by scientists from the Faculty of Technology at the University of Novi Sad. This kind of educational approach accomplishes at least two important objectives. First, students have an opportunity to learn about connections between Mathematics and MSE. Second, this educational approach raises chances of MSE being a possible choice of future profession for students. This is very important since most high school students are not acquainted with MSE as a profession.
T2  - Journal of Materials Education
T1  - The educational approach for introducing contemporary materials science research to high school mathematics
EP  - 114
IS  - 3-4
SP  - 99
VL  - 39
UR  - conv_1307
ER  - 

@article{
author = "Budinski, Natalija and Jovičić, Mirjana and Vukić, Nevena and Popović, Mlađan",
year = "2017",
abstract = "We report a new educational approach for teaching students about contemporary Materials Science and Engineering (MSE) research. It describes how MSE can be introduced to high school students as examples for analysis in mathematical classes. We discuss, in this example, how such students are introduced to MSE materials preparation experiments by scientists from the Faculty of Technology at the University of Novi Sad. This kind of educational approach accomplishes at least two important objectives. First, students have an opportunity to learn about connections between Mathematics and MSE. Second, this educational approach raises chances of MSE being a possible choice of future profession for students. This is very important since most high school students are not acquainted with MSE as a profession.",
journal = "Journal of Materials Education",
title = "The educational approach for introducing contemporary materials science research to high school mathematics",
pages = "114-99",
number = "3-4",
volume = "39",
url = "conv_1307"
}

Budinski, N., Jovičić, M., Vukić, N.,& Popović, M.. (2017). The educational approach for introducing contemporary materials science research to high school mathematics. in Journal of Materials Education, 39(3-4), 99-114.
conv_1307

Budinski N, Jovičić M, Vukić N, Popović M. The educational approach for introducing contemporary materials science research to high school mathematics. in Journal of Materials Education. 2017;39(3-4):99-114.
conv_1307 .

Budinski, Natalija, Jovičić, Mirjana, Vukić, Nevena, Popović, Mlađan, "The educational approach for introducing contemporary materials science research to high school mathematics" in Journal of Materials Education, 39, no. 3-4 (2017):99-114,
conv_1307 .

TY  - JOUR
AU  - Gavrilović-Grmuša, Ivana
AU  - Dunky, Manfred
AU  - Điporović-Momčilović, Milanka
AU  - Popović, Mlađan
AU  - Popović, Jasmina
PY  - 2016
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/778
AB  - This work deals with the influence of specific pressure during the press process on the radial and tangential penetration of urea-formaldehyde (UF) adhesive into poplar, as well as on the shear strength of lap joints prepared at these different pressures. An epi-fluorescence microscope was used for measuring the adhesive penetration when investigating microtome slides (20-mu m thick) cut from the joint samples. The average penetration depth (d(ap)) and the size of the interphase region (I) increased with the increase of pressure from 0.5 to 1.0 N/mm(2). Further increase in the pressure to 1.5 N/mm(2) did not produce a significant change in d(ap) or I. On the contrary, the area of filled lumens and rays (A) showed a steady decrease as the specific pressure increased. Such behavior influenced the filled interphase region (I-f), which also decreased with increased pressure. Tangential samples (radial penetration) obtained higher values of lap shear strength and showed less dependence on the specific pressure than the radial samples (tangential penetration). Higher shear strength based on radial penetration corresponded to the thicker interphase region of these samples. The highest shear strength for both directions of penetration was obtained for the specific pressure of 1.0 N/mm(2).
PB  - North Carolina State University
T2  - BioResources
T1  - Influence of Pressure on the Radial and Tangential Penetration of Adhesive Resin into Poplar Wood and on the Shear Strength of Adhesive Joints
EP  - 2255
IS  - 1
SP  - 2238
VL  - 11
DO  - 10.15376/biores.11.1.2238-2255
UR  - conv_2111
ER  - 

@article{
author = "Gavrilović-Grmuša, Ivana and Dunky, Manfred and Điporović-Momčilović, Milanka and Popović, Mlađan and Popović, Jasmina",
year = "2016",
abstract = "This work deals with the influence of specific pressure during the press process on the radial and tangential penetration of urea-formaldehyde (UF) adhesive into poplar, as well as on the shear strength of lap joints prepared at these different pressures. An epi-fluorescence microscope was used for measuring the adhesive penetration when investigating microtome slides (20-mu m thick) cut from the joint samples. The average penetration depth (d(ap)) and the size of the interphase region (I) increased with the increase of pressure from 0.5 to 1.0 N/mm(2). Further increase in the pressure to 1.5 N/mm(2) did not produce a significant change in d(ap) or I. On the contrary, the area of filled lumens and rays (A) showed a steady decrease as the specific pressure increased. Such behavior influenced the filled interphase region (I-f), which also decreased with increased pressure. Tangential samples (radial penetration) obtained higher values of lap shear strength and showed less dependence on the specific pressure than the radial samples (tangential penetration). Higher shear strength based on radial penetration corresponded to the thicker interphase region of these samples. The highest shear strength for both directions of penetration was obtained for the specific pressure of 1.0 N/mm(2).",
publisher = "North Carolina State University",
journal = "BioResources",
title = "Influence of Pressure on the Radial and Tangential Penetration of Adhesive Resin into Poplar Wood and on the Shear Strength of Adhesive Joints",
pages = "2255-2238",
number = "1",
volume = "11",
doi = "10.15376/biores.11.1.2238-2255",
url = "conv_2111"
}

Gavrilović-Grmuša, I., Dunky, M., Điporović-Momčilović, M., Popović, M.,& Popović, J.. (2016). Influence of Pressure on the Radial and Tangential Penetration of Adhesive Resin into Poplar Wood and on the Shear Strength of Adhesive Joints. in BioResources
North Carolina State University., 11(1), 2238-2255.
https://doi.org/10.15376/biores.11.1.2238-2255
conv_2111

Gavrilović-Grmuša I, Dunky M, Điporović-Momčilović M, Popović M, Popović J. Influence of Pressure on the Radial and Tangential Penetration of Adhesive Resin into Poplar Wood and on the Shear Strength of Adhesive Joints. in BioResources. 2016;11(1):2238-2255.
doi:10.15376/biores.11.1.2238-2255
conv_2111 .

Gavrilović-Grmuša, Ivana, Dunky, Manfred, Điporović-Momčilović, Milanka, Popović, Mlađan, Popović, Jasmina, "Influence of Pressure on the Radial and Tangential Penetration of Adhesive Resin into Poplar Wood and on the Shear Strength of Adhesive Joints" in BioResources, 11, no. 1 (2016):2238-2255,
https://doi.org/10.15376/biores.11.1.2238-2255 .,
conv_2111 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
AU  - Gavrilović-Grmuša, Ivana
AU  - Popović, Jasmina
PY  - 2016
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/735
AB  - Imajući u vidu da kiselost drveta ima važnu ulogu u mnogim oblastima primene drvnih proizvoda, u ovom radu istražen je sadržaj kiselina u uzorcima domaćih vrsta bukve, jele i topole. Shodno tome, određen je sadržaj kiselina rastvorljivih u hladnoj vodi, kao i sadržaj vezanih kiselina, odnosno kiselina koje nisu rastvorljive u hladnoj vodi. Kako bi se izračunao sadržaj vezanih kiselina u drvetu bilo je neophodno da se odredi ukupan sadržaj kiselina. U tu svrhu primenjena je metoda koja se zasniva na ekstrakciji drvnog materijala u 0,1 M rastvoru natrijum acetata, na sobnoj temperaturi; Nakon čega je titracijom sa 0,1 M natrijum hidroksidom određena ekvivalentna tačka koja predstavlja ukupan sadržaj kiselina u datom uzorku. Sadržaj vezanih (nerastvornih) kiselina određen je kao razlika ukupnih i rastvorljivih kiselina. Sadržaj rastvorljivih kiselina bio je 3 do 5 puta manji od sadržaja vezanih kiselina, pri čemu su jedino uzorci topole pokazali statistički niže vrednosti. Međutim, sadržaj vezanih kiselina značajno se razlikovao u odnosu na ispitivanu drvnu vrstu. Vezanih kiselina bilo je najviše u uzorcima drveta jele, i to približno dva puta više u odnosu na topolu, te za oko 61% više u odnosu na bukvu. Takođe, uočena je jaka korelacija između sadržaja vezanih kiselina u drvetu i vremena želiranja urea-formaldehidnog (UF) veziva u smeši sa odgovarajućim ekstraktima u vreloj vodi. Rezultati ovog istraživanja ukazuju na to da kiselost drveta predstavlja značajan uticajni faktor u procesima u drvnoj industriji koji se zasnivaju na upotrebi UF veziva.
AB  - The acidity of wood has an important role in many areas of wood applications. Hence, this paper presents a study on the acidity of beech, fir and poplar, as the representatives of the most industrially utilized wood species in Serbia. The contents of both the soluble and insoluble acids were determined through the extraction methods with cold distilled water and sodium acetate solution, respectively, followed by the titration with sodium hydroxide solution. The acidity strongly differs among the three wood species used in this research. The amount of insoluble acids was the highest in fir, almost twice as much than in poplar, and about 68% higher than in fir wood species. Such differences also showed a strong correlation with the gel times of UF adhesive mixes with hot water extracts.
PB  - Univerzitet u Beogradu - Šumarski fakultet, Beograd
T2  - Glasnik Šumarskog fakulteta
T1  - Kiselost odabranih vrsta industrijskog drveća u Srbiji
T1  - Acidity of selected industrial wood species in Serbia
EP  - 76
IS  - 113
SP  - 69
DO  - 10.2298/GSF1613069P
UR  - conv_437
ER  - 

@article{
author = "Popović, Mlađan and Điporović-Momčilović, Milanka and Gavrilović-Grmuša, Ivana and Popović, Jasmina",
year = "2016",
abstract = "Imajući u vidu da kiselost drveta ima važnu ulogu u mnogim oblastima primene drvnih proizvoda, u ovom radu istražen je sadržaj kiselina u uzorcima domaćih vrsta bukve, jele i topole. Shodno tome, određen je sadržaj kiselina rastvorljivih u hladnoj vodi, kao i sadržaj vezanih kiselina, odnosno kiselina koje nisu rastvorljive u hladnoj vodi. Kako bi se izračunao sadržaj vezanih kiselina u drvetu bilo je neophodno da se odredi ukupan sadržaj kiselina. U tu svrhu primenjena je metoda koja se zasniva na ekstrakciji drvnog materijala u 0,1 M rastvoru natrijum acetata, na sobnoj temperaturi; Nakon čega je titracijom sa 0,1 M natrijum hidroksidom određena ekvivalentna tačka koja predstavlja ukupan sadržaj kiselina u datom uzorku. Sadržaj vezanih (nerastvornih) kiselina određen je kao razlika ukupnih i rastvorljivih kiselina. Sadržaj rastvorljivih kiselina bio je 3 do 5 puta manji od sadržaja vezanih kiselina, pri čemu su jedino uzorci topole pokazali statistički niže vrednosti. Međutim, sadržaj vezanih kiselina značajno se razlikovao u odnosu na ispitivanu drvnu vrstu. Vezanih kiselina bilo je najviše u uzorcima drveta jele, i to približno dva puta više u odnosu na topolu, te za oko 61% više u odnosu na bukvu. Takođe, uočena je jaka korelacija između sadržaja vezanih kiselina u drvetu i vremena želiranja urea-formaldehidnog (UF) veziva u smeši sa odgovarajućim ekstraktima u vreloj vodi. Rezultati ovog istraživanja ukazuju na to da kiselost drveta predstavlja značajan uticajni faktor u procesima u drvnoj industriji koji se zasnivaju na upotrebi UF veziva., The acidity of wood has an important role in many areas of wood applications. Hence, this paper presents a study on the acidity of beech, fir and poplar, as the representatives of the most industrially utilized wood species in Serbia. The contents of both the soluble and insoluble acids were determined through the extraction methods with cold distilled water and sodium acetate solution, respectively, followed by the titration with sodium hydroxide solution. The acidity strongly differs among the three wood species used in this research. The amount of insoluble acids was the highest in fir, almost twice as much than in poplar, and about 68% higher than in fir wood species. Such differences also showed a strong correlation with the gel times of UF adhesive mixes with hot water extracts.",
publisher = "Univerzitet u Beogradu - Šumarski fakultet, Beograd",
journal = "Glasnik Šumarskog fakulteta",
title = "Kiselost odabranih vrsta industrijskog drveća u Srbiji, Acidity of selected industrial wood species in Serbia",
pages = "76-69",
number = "113",
doi = "10.2298/GSF1613069P",
url = "conv_437"
}

Popović, M., Điporović-Momčilović, M., Gavrilović-Grmuša, I.,& Popović, J.. (2016). Kiselost odabranih vrsta industrijskog drveća u Srbiji. in Glasnik Šumarskog fakulteta
Univerzitet u Beogradu - Šumarski fakultet, Beograd.(113), 69-76.
https://doi.org/10.2298/GSF1613069P
conv_437

Popović M, Điporović-Momčilović M, Gavrilović-Grmuša I, Popović J. Kiselost odabranih vrsta industrijskog drveća u Srbiji. in Glasnik Šumarskog fakulteta. 2016;(113):69-76.
doi:10.2298/GSF1613069P
conv_437 .

Popović, Mlađan, Điporović-Momčilović, Milanka, Gavrilović-Grmuša, Ivana, Popović, Jasmina, "Kiselost odabranih vrsta industrijskog drveća u Srbiji" in Glasnik Šumarskog fakulteta, no. 113 (2016):69-76,
https://doi.org/10.2298/GSF1613069P .,
conv_437 .

TY  - CONF
AU  - Popović, Jasmina
AU  - Klašnja, Bojana
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
AU  - Gavrilović-Grmuša, Ivana
PY  - 2016
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/788
AB  - The evaluation of wood chemical composition is of the great importance for the optimal utilization of wood raw material. Certain application areas of wood and wood products are closely related to the chemistry of wood components. Variability of the chemical composition of wood is common for the same wood species and even inside the single tree. Such variations may have significant effects on the properties of related wood material. Hence, this work presents a detailed evaluation of chemical characteristics of juvenile (10 years) and mature wood samples (72 years) of the Narrow-leaved Ash. The samples were taken from the tree trunks at three different heights. The contents of cellulose and lignin were higher in the mature wood samples. The cellulose content decreased with the increase in height of the tree trunk, while the vertical position had no significant effect on the lignin content. The content of the extraneous material, dissolved in toluene-ethanol solution, was significantly lower in the samples of juvenile wood, and it decreased with the increase in height. However, the same samples had the higher content of ash and the extracts dissolved in hot water, in regard to the samples of mature wood.
PB  - University of Zagreb - Faculty of Forestry
C3  - 27th International Conference on Wood Science and Technology, ICWST 2016: Implementation of Wood Science in Woodworking Sector - Proceedings
T1  - Variability in chemical composition of narrow-leaved ash (fraxinus angustifolia Vahl. ssp. Pannonica soó & simon) in regard to its age and possition inside the tree
EP  - 184
SP  - 175
UR  - conv_2120
ER  - 

@conference{
author = "Popović, Jasmina and Klašnja, Bojana and Popović, Mlađan and Điporović-Momčilović, Milanka and Gavrilović-Grmuša, Ivana",
year = "2016",
abstract = "The evaluation of wood chemical composition is of the great importance for the optimal utilization of wood raw material. Certain application areas of wood and wood products are closely related to the chemistry of wood components. Variability of the chemical composition of wood is common for the same wood species and even inside the single tree. Such variations may have significant effects on the properties of related wood material. Hence, this work presents a detailed evaluation of chemical characteristics of juvenile (10 years) and mature wood samples (72 years) of the Narrow-leaved Ash. The samples were taken from the tree trunks at three different heights. The contents of cellulose and lignin were higher in the mature wood samples. The cellulose content decreased with the increase in height of the tree trunk, while the vertical position had no significant effect on the lignin content. The content of the extraneous material, dissolved in toluene-ethanol solution, was significantly lower in the samples of juvenile wood, and it decreased with the increase in height. However, the same samples had the higher content of ash and the extracts dissolved in hot water, in regard to the samples of mature wood.",
publisher = "University of Zagreb - Faculty of Forestry",
journal = "27th International Conference on Wood Science and Technology, ICWST 2016: Implementation of Wood Science in Woodworking Sector - Proceedings",
title = "Variability in chemical composition of narrow-leaved ash (fraxinus angustifolia Vahl. ssp. Pannonica soó & simon) in regard to its age and possition inside the tree",
pages = "184-175",
url = "conv_2120"
}

Popović, J., Klašnja, B., Popović, M., Điporović-Momčilović, M.,& Gavrilović-Grmuša, I.. (2016). Variability in chemical composition of narrow-leaved ash (fraxinus angustifolia Vahl. ssp. Pannonica soó & simon) in regard to its age and possition inside the tree. in 27th International Conference on Wood Science and Technology, ICWST 2016: Implementation of Wood Science in Woodworking Sector - Proceedings
University of Zagreb - Faculty of Forestry., 175-184.
conv_2120

Popović J, Klašnja B, Popović M, Điporović-Momčilović M, Gavrilović-Grmuša I. Variability in chemical composition of narrow-leaved ash (fraxinus angustifolia Vahl. ssp. Pannonica soó & simon) in regard to its age and possition inside the tree. in 27th International Conference on Wood Science and Technology, ICWST 2016: Implementation of Wood Science in Woodworking Sector - Proceedings. 2016;:175-184.
conv_2120 .

Popović, Jasmina, Klašnja, Bojana, Popović, Mlađan, Điporović-Momčilović, Milanka, Gavrilović-Grmuša, Ivana, "Variability in chemical composition of narrow-leaved ash (fraxinus angustifolia Vahl. ssp. Pannonica soó & simon) in regard to its age and possition inside the tree" in 27th International Conference on Wood Science and Technology, ICWST 2016: Implementation of Wood Science in Woodworking Sector - Proceedings (2016):175-184,
conv_2120 .

TY  - CONF
AU  - Popović, Jasmina
AU  - Điporović-Momčilović, Milanka
AU  - Popović, Mlađan
AU  - Gavrilović-Grmuša, Ivana
PY  - 2016
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/771
AB  - Chemical treatments may cause various changes in wood chemical composition, such as the removal of extractives and certain parts of lignin, hemicelluloses and cellulose. This may involve variety of chemical reactions in wood material. The effects of the applied treatments depends on the treatment conditions (type and concentration of chemicals, pH value, temperature, pressure, treatment duration), but also on the characteristics of lignocellulose material itself. Treatments may change the hydrophilic character of wood, which may affect its dimensional stability. This paper presents the study on the influence of the acetic acid and sodium carbonate treatments on the dimensional stability of Narrow-leaved Ash. All the treatments with acetic acid solutions have improved the dimensional stability of the samples. It was also improved after the treatments with the lowest concentration of sodium carbonate solution (AT 1). However, increased concentration of sodium carbonate and the higher temperature applied had negative effects on dimensional stability of the samples.
PB  - Vienna University of Technology
C3  - WCTE 2016 - World Conference on Timber Engineering
T1  - The infuence of chemical treatments on dimensional stability of Narrow leaved Ash
UR  - conv_2079
ER  - 

@conference{
author = "Popović, Jasmina and Điporović-Momčilović, Milanka and Popović, Mlađan and Gavrilović-Grmuša, Ivana",
year = "2016",
abstract = "Chemical treatments may cause various changes in wood chemical composition, such as the removal of extractives and certain parts of lignin, hemicelluloses and cellulose. This may involve variety of chemical reactions in wood material. The effects of the applied treatments depends on the treatment conditions (type and concentration of chemicals, pH value, temperature, pressure, treatment duration), but also on the characteristics of lignocellulose material itself. Treatments may change the hydrophilic character of wood, which may affect its dimensional stability. This paper presents the study on the influence of the acetic acid and sodium carbonate treatments on the dimensional stability of Narrow-leaved Ash. All the treatments with acetic acid solutions have improved the dimensional stability of the samples. It was also improved after the treatments with the lowest concentration of sodium carbonate solution (AT 1). However, increased concentration of sodium carbonate and the higher temperature applied had negative effects on dimensional stability of the samples.",
publisher = "Vienna University of Technology",
journal = "WCTE 2016 - World Conference on Timber Engineering",
title = "The infuence of chemical treatments on dimensional stability of Narrow leaved Ash",
url = "conv_2079"
}

Popović, J., Điporović-Momčilović, M., Popović, M.,& Gavrilović-Grmuša, I.. (2016). The infuence of chemical treatments on dimensional stability of Narrow leaved Ash. in WCTE 2016 - World Conference on Timber Engineering
Vienna University of Technology..
conv_2079

Popović J, Điporović-Momčilović M, Popović M, Gavrilović-Grmuša I. The infuence of chemical treatments on dimensional stability of Narrow leaved Ash. in WCTE 2016 - World Conference on Timber Engineering. 2016;.
conv_2079 .

Popović, Jasmina, Điporović-Momčilović, Milanka, Popović, Mlađan, Gavrilović-Grmuša, Ivana, "The infuence of chemical treatments on dimensional stability of Narrow leaved Ash" in WCTE 2016 - World Conference on Timber Engineering (2016),
conv_2079 .

TY  - JOUR
AU  - Popović, Jasmina
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
AU  - Gavrilović-Grmuša, Ivana
PY  - 2015
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/722
AB  - The effect of chemical treatment on wood tissue leads to changes in the chemical composition of wood, thereby changing its wetability and its chemical reactivity with adhesive. In this study, wood samples of narrow-leaved ash (Fraxinus angustifolia Vahl. ssp. Pannonica Soo & Simon) were treated with water and with the aqueous solutions of acetic acid and sodium carbonate at the temperatures of 100 and 120 degrees C, and for a period of 60 min. The addition of acetic acid and sodium carbonate was 0.03, 0.06 and 0.09 g.g(-1) dry matter of wood. The effects of the applied treatments on the lap shear strength were evaluated by the standard test method using urea-formaldehyde adhesive. The entire sample series treated with the sodium carbonate have shown the significant increase of the shear strength when compared to the control sample series (17.5 to 49.6 %). In addition, the increase of the shear strength corresponded to the increase in the concentration of the sodium carbonate solution. On the other side, the acetic acid and the water treatments have not caused any significant changes to the shear strength of the samples. The increase in the concentration of the acetic acid solution has showed a tendency to decrease the shear strength, but this effect could not be confirmed statistically. Finally, the results of the shear strength for all the treated sample series have not been significantly affected by the applied temperature.
PB  - Statny Drevarsky Vyskumny Ustav
T2  - Wood Research
T1  - Effects of the chemical treatment conditions of the narrow-leaved ash ( fraxinus angustifolia vahl. Ssp pannonica soo & simon) on the lap shear strength
EP  - 554
IS  - 4
SP  - 543
VL  - 60
UR  - conv_2135
ER  - 

@article{
author = "Popović, Jasmina and Popović, Mlađan and Điporović-Momčilović, Milanka and Gavrilović-Grmuša, Ivana",
year = "2015",
abstract = "The effect of chemical treatment on wood tissue leads to changes in the chemical composition of wood, thereby changing its wetability and its chemical reactivity with adhesive. In this study, wood samples of narrow-leaved ash (Fraxinus angustifolia Vahl. ssp. Pannonica Soo & Simon) were treated with water and with the aqueous solutions of acetic acid and sodium carbonate at the temperatures of 100 and 120 degrees C, and for a period of 60 min. The addition of acetic acid and sodium carbonate was 0.03, 0.06 and 0.09 g.g(-1) dry matter of wood. The effects of the applied treatments on the lap shear strength were evaluated by the standard test method using urea-formaldehyde adhesive. The entire sample series treated with the sodium carbonate have shown the significant increase of the shear strength when compared to the control sample series (17.5 to 49.6 %). In addition, the increase of the shear strength corresponded to the increase in the concentration of the sodium carbonate solution. On the other side, the acetic acid and the water treatments have not caused any significant changes to the shear strength of the samples. The increase in the concentration of the acetic acid solution has showed a tendency to decrease the shear strength, but this effect could not be confirmed statistically. Finally, the results of the shear strength for all the treated sample series have not been significantly affected by the applied temperature.",
publisher = "Statny Drevarsky Vyskumny Ustav",
journal = "Wood Research",
title = "Effects of the chemical treatment conditions of the narrow-leaved ash ( fraxinus angustifolia vahl. Ssp pannonica soo & simon) on the lap shear strength",
pages = "554-543",
number = "4",
volume = "60",
url = "conv_2135"
}

Popović, J., Popović, M., Điporović-Momčilović, M.,& Gavrilović-Grmuša, I.. (2015). Effects of the chemical treatment conditions of the narrow-leaved ash ( fraxinus angustifolia vahl. Ssp pannonica soo & simon) on the lap shear strength. in Wood Research
Statny Drevarsky Vyskumny Ustav., 60(4), 543-554.
conv_2135

Popović J, Popović M, Điporović-Momčilović M, Gavrilović-Grmuša I. Effects of the chemical treatment conditions of the narrow-leaved ash ( fraxinus angustifolia vahl. Ssp pannonica soo & simon) on the lap shear strength. in Wood Research. 2015;60(4):543-554.
conv_2135 .

Popović, Jasmina, Popović, Mlađan, Điporović-Momčilović, Milanka, Gavrilović-Grmuša, Ivana, "Effects of the chemical treatment conditions of the narrow-leaved ash ( fraxinus angustifolia vahl. Ssp pannonica soo & simon) on the lap shear strength" in Wood Research, 60, no. 4 (2015):543-554,
conv_2135 .

TY  - JOUR
AU  - Budinski, Natalija
AU  - Takaci, Đurđica
AU  - Jovičić, Mirjana
AU  - Pavličević, Jelena
AU  - Ristić, Ivan
AU  - Vukić, Nevena
AU  - Teofilović, Vesna
AU  - Popović, Mlađan
PY  - 2015
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/645
AB  - We discuss a new educational approach for teaching Materials Science and Engineering (MSE). MSE can be introduced to high school students via classes of Mathematics. We describe how such students are introduced to MSE experiments by scientists from the Faculty of Technology of the University of Novi Sad. Subsequently, students share their experiences with their peers. Application of our approach accomplishes at least two objectives. First, students see Applied Mathematics via demonstrated connections between Mathematics and MSE. Second, MSE appears on their radar when they reach the stage of choosing their major at the college level and thus their future professions. This is important since most high school students do not get in contact with exhibitions of the Materials Research Society or with other MSE related activities of professional societies.
T2  - Journal of Materials Education
T1  - Materials science experiments as a tool for learning and applying high school mathematics
EP  - 84
IS  - 1-2
SP  - 59
VL  - 37
UR  - conv_1161
ER  - 

@article{
author = "Budinski, Natalija and Takaci, Đurđica and Jovičić, Mirjana and Pavličević, Jelena and Ristić, Ivan and Vukić, Nevena and Teofilović, Vesna and Popović, Mlađan",
year = "2015",
abstract = "We discuss a new educational approach for teaching Materials Science and Engineering (MSE). MSE can be introduced to high school students via classes of Mathematics. We describe how such students are introduced to MSE experiments by scientists from the Faculty of Technology of the University of Novi Sad. Subsequently, students share their experiences with their peers. Application of our approach accomplishes at least two objectives. First, students see Applied Mathematics via demonstrated connections between Mathematics and MSE. Second, MSE appears on their radar when they reach the stage of choosing their major at the college level and thus their future professions. This is important since most high school students do not get in contact with exhibitions of the Materials Research Society or with other MSE related activities of professional societies.",
journal = "Journal of Materials Education",
title = "Materials science experiments as a tool for learning and applying high school mathematics",
pages = "84-59",
number = "1-2",
volume = "37",
url = "conv_1161"
}

Budinski, N., Takaci, Đ., Jovičić, M., Pavličević, J., Ristić, I., Vukić, N., Teofilović, V.,& Popović, M.. (2015). Materials science experiments as a tool for learning and applying high school mathematics. in Journal of Materials Education, 37(1-2), 59-84.
conv_1161

Budinski N, Takaci Đ, Jovičić M, Pavličević J, Ristić I, Vukić N, Teofilović V, Popović M. Materials science experiments as a tool for learning and applying high school mathematics. in Journal of Materials Education. 2015;37(1-2):59-84.
conv_1161 .

Budinski, Natalija, Takaci, Đurđica, Jovičić, Mirjana, Pavličević, Jelena, Ristić, Ivan, Vukić, Nevena, Teofilović, Vesna, Popović, Mlađan, "Materials science experiments as a tool for learning and applying high school mathematics" in Journal of Materials Education, 37, no. 1-2 (2015):59-84,
conv_1161 .

TY  - THES
AU  - Popović, Mlađan M.
PY  - 2012
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=328
UR  - https://nardus.mpn.gov.rs/handle/123456789/3510
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:5823/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=512447900
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/6
AB  - U oviru ove doktorske disertacije istražen je uticaj drvnih vrsta bukve, jele i topole, na kinetiku očvršćavanja komercijalnog urea-formaldehidnog (UF) adheziva, namenjenog za proizvodnju ploča iverica. U tom cilju primenjene su metode diferencijalne skenirajuće kalorimetrije (DSC), dielektrične analize (DEA) i dinamičko mehaničke analize (DMA). DSC ispitivanja obavljena su u dinamičkom režimu, pri brzinama zagrevanja (β) od 5; 10; 15 i 20 oC/min. Ispitivane uzorke činili su čist UF adheziv, smeše UF adheziva sa drvnim brašnom i smeše UF adheziva sa ekstraktivima ispitivanih vrsta drveta. Dodatak katalizatora (NH4Cl) iznosio je 0,2%, mereno na suvu supstancu adheziva, za sve ispitivane uzorke. Rezultati merenja predstavljeni su vrednostima temperature maksimuma reakcije (Tp), entalpijom reakcije (ΔH), kao i energijom aktivacije (Ea). Takođe, na rezultatima DSC merenja primenjeni su izokonverzioni modeli Ozawa-Flynn-Wall (OFW) i Kissinger-Akahira-Sunose (KAS). DEA ispitivanja obavljena su u izotermalnom režimu i u uslovima vrelog presovanja furnirskih uzoraka ispitivanih drvnih vrsta, slepljenih UF adhezivom sa dodatkom NH4Cl od 0,2%, mereno na suvu supstancu adheziva. Temperature presovanja iznosile su 120; 140 i 160 oC. Očitavanje dielektričnih parametara obavljeno je pomoću IDEX senzora postavljenog na liniji lepljenja i povezanog sa instrumentom za merenje impendanse. Vrednosti stepena reakcije (α), dobijene su na osnovu promene električne provodljivosti. DMA ispitivanja obavljena su pri konstantnom oscilatornom režimu naprezanja na smicanje i pri temperaturi od 80 oC. Ispitivane uzorke predstavljali su čist UF adheziv i smeše UF adheziva sa ekstraktivima ispitivanih vrsta drveta. Posebne serije ispitivanja obavljene su sa dodatkom NH4Cl od 0,2%, mereno na suvu supstancu adheziva, kao i bez dodatka katalizatora. Vreme želiranja ispitivanih uzoraka određeno je presekom kriva modula sačuvane energije (G') i modula izgubljene energije (G"), odnosno za vrednost faktora gubitka tanδ=1. Ispitivanjem UF adheziva u smeši sa drvnim ekstraktivima, pomoću DSC i DMA metoda, utvrđeno je da pH vrednost i kiseli puferni kapacitet ispitivanih drvnih vrsta značajno utiču na kinetiku reakcije očvršćavanja. Niže vrednosti pomenutih hemijskih karakteristika ekstraktiva uticale su na smanjenje temperature maksimuma reakcije i energije aktivacije, kao i na kraće vreme želiranja odgovarajuće ispitivane smeše. Rezultati ispitivanja UF adheziva u smeši sa drvnim brašnom, pomoću DSC metode, kao i rezultati ispitivanja dielektričnih parametara očvršćavanja UF adheziva pri vrelom presovanju furnirskih uzoraka, pokazali su značajan uticaj anatomske građe ispitivanih drvnih vrsta na tok očvršćavanja UF adheziva.
AB  - curing kinetics of commercial urea-formaldehyde (UF) adhesive was investigated. With this objective, the following thermal analysis methods were utilized: differential scanning calorimetry (DSC), dielectric analysis (DEA) and dynamical mechanical analysis (DMA). DSC measurements were obtained in dynamical scanning regime with the heating rates (β) of 5; 10; 15 i 20 oC/min. Test samples consisted of pure UF adhesive, UF adhesive / wood flour mixes and UF adhesive / wood extractives mixes of selected wood species. Catalyst (NH4Cl) addition was 0.2% (per oven dry weight) for all test samples. Results of peak temperature (Tp), enthalpy of reaction (ΔH), and activation energy (Ea) were analyzed for each UF adhesive system. In addition, the isoconverzional models of Ozawa-Flynn-Wall (OFW) and Kissinger-Akahira-Sunose (KAS) were applied on the DSC test data. DEA tests proceeded in the isothermal regime in the real hot pressing conditions using veneer samples of the selected wood species as adherents. UF adhesive was applied with the NH4Cl addition of 0.2% (per oven dry weight). Press temperatures were 120; 140 i 160 oC. Dielectric parameters were recorded through IDEX sensor applied on the bond line of veneer samples and connected to LCR meter. Degree of reaction (α) was obtained on the basis of electric conductivity. DMA rheological tests were performed in the sinusoidal shear stress regime at the temperature of 80 oC. Test samples consisted of pure UF adhesive and the UF adhesive / wood extractives mixes. Two separate sample series were used, one with the NH4Cl addition of 0.2% (per oven dry weight) and the other without catalyst addition. Gel time was determined at the crossover of the storage modulus (G') and loss modulus (G"), resulting in the loss factor tanδ=1. Results of DSC and DMA tests on UF adhesive / wood extractive mixes, showed significant influence of pH value and acid buffer capacity of selected wood species on kinetics of curing reaction. Lower values of said chemical characteristics of a given extractive, resulted in decrease of peak temperature and activation energy, as well as in shorter gel time for a corresponding mixture. Both, DSC measurements of UF adhesive / wood flour mixtures and DEA results of UF adhesive cure in the hot pressed veneer samples, have showed significant influence of wood anatomy structure on curing behavior of UF adhesive.
PB  - Univerzitet u Beogradu, Šumarski fakultet
T1  - Očvršćavanje urea-formaldehidnog adheziva za ploče iverice u prisustvu nekih domaćih drvnih vrsta
T1  - Curing of urea-formaldehyde adhesive for particleboards in the presence of some domestic wood species
UR  - https://hdl.handle.net/21.15107/rcub_nardus_3510
UR  - t-5042
ER  - 

@phdthesis{
author = "Popović, Mlađan M.",
year = "2012",
abstract = "U oviru ove doktorske disertacije istražen je uticaj drvnih vrsta bukve, jele i topole, na kinetiku očvršćavanja komercijalnog urea-formaldehidnog (UF) adheziva, namenjenog za proizvodnju ploča iverica. U tom cilju primenjene su metode diferencijalne skenirajuće kalorimetrije (DSC), dielektrične analize (DEA) i dinamičko mehaničke analize (DMA). DSC ispitivanja obavljena su u dinamičkom režimu, pri brzinama zagrevanja (β) od 5; 10; 15 i 20 oC/min. Ispitivane uzorke činili su čist UF adheziv, smeše UF adheziva sa drvnim brašnom i smeše UF adheziva sa ekstraktivima ispitivanih vrsta drveta. Dodatak katalizatora (NH4Cl) iznosio je 0,2%, mereno na suvu supstancu adheziva, za sve ispitivane uzorke. Rezultati merenja predstavljeni su vrednostima temperature maksimuma reakcije (Tp), entalpijom reakcije (ΔH), kao i energijom aktivacije (Ea). Takođe, na rezultatima DSC merenja primenjeni su izokonverzioni modeli Ozawa-Flynn-Wall (OFW) i Kissinger-Akahira-Sunose (KAS). DEA ispitivanja obavljena su u izotermalnom režimu i u uslovima vrelog presovanja furnirskih uzoraka ispitivanih drvnih vrsta, slepljenih UF adhezivom sa dodatkom NH4Cl od 0,2%, mereno na suvu supstancu adheziva. Temperature presovanja iznosile su 120; 140 i 160 oC. Očitavanje dielektričnih parametara obavljeno je pomoću IDEX senzora postavljenog na liniji lepljenja i povezanog sa instrumentom za merenje impendanse. Vrednosti stepena reakcije (α), dobijene su na osnovu promene električne provodljivosti. DMA ispitivanja obavljena su pri konstantnom oscilatornom režimu naprezanja na smicanje i pri temperaturi od 80 oC. Ispitivane uzorke predstavljali su čist UF adheziv i smeše UF adheziva sa ekstraktivima ispitivanih vrsta drveta. Posebne serije ispitivanja obavljene su sa dodatkom NH4Cl od 0,2%, mereno na suvu supstancu adheziva, kao i bez dodatka katalizatora. Vreme želiranja ispitivanih uzoraka određeno je presekom kriva modula sačuvane energije (G') i modula izgubljene energije (G"), odnosno za vrednost faktora gubitka tanδ=1. Ispitivanjem UF adheziva u smeši sa drvnim ekstraktivima, pomoću DSC i DMA metoda, utvrđeno je da pH vrednost i kiseli puferni kapacitet ispitivanih drvnih vrsta značajno utiču na kinetiku reakcije očvršćavanja. Niže vrednosti pomenutih hemijskih karakteristika ekstraktiva uticale su na smanjenje temperature maksimuma reakcije i energije aktivacije, kao i na kraće vreme želiranja odgovarajuće ispitivane smeše. Rezultati ispitivanja UF adheziva u smeši sa drvnim brašnom, pomoću DSC metode, kao i rezultati ispitivanja dielektričnih parametara očvršćavanja UF adheziva pri vrelom presovanju furnirskih uzoraka, pokazali su značajan uticaj anatomske građe ispitivanih drvnih vrsta na tok očvršćavanja UF adheziva., curing kinetics of commercial urea-formaldehyde (UF) adhesive was investigated. With this objective, the following thermal analysis methods were utilized: differential scanning calorimetry (DSC), dielectric analysis (DEA) and dynamical mechanical analysis (DMA). DSC measurements were obtained in dynamical scanning regime with the heating rates (β) of 5; 10; 15 i 20 oC/min. Test samples consisted of pure UF adhesive, UF adhesive / wood flour mixes and UF adhesive / wood extractives mixes of selected wood species. Catalyst (NH4Cl) addition was 0.2% (per oven dry weight) for all test samples. Results of peak temperature (Tp), enthalpy of reaction (ΔH), and activation energy (Ea) were analyzed for each UF adhesive system. In addition, the isoconverzional models of Ozawa-Flynn-Wall (OFW) and Kissinger-Akahira-Sunose (KAS) were applied on the DSC test data. DEA tests proceeded in the isothermal regime in the real hot pressing conditions using veneer samples of the selected wood species as adherents. UF adhesive was applied with the NH4Cl addition of 0.2% (per oven dry weight). Press temperatures were 120; 140 i 160 oC. Dielectric parameters were recorded through IDEX sensor applied on the bond line of veneer samples and connected to LCR meter. Degree of reaction (α) was obtained on the basis of electric conductivity. DMA rheological tests were performed in the sinusoidal shear stress regime at the temperature of 80 oC. Test samples consisted of pure UF adhesive and the UF adhesive / wood extractives mixes. Two separate sample series were used, one with the NH4Cl addition of 0.2% (per oven dry weight) and the other without catalyst addition. Gel time was determined at the crossover of the storage modulus (G') and loss modulus (G"), resulting in the loss factor tanδ=1. Results of DSC and DMA tests on UF adhesive / wood extractive mixes, showed significant influence of pH value and acid buffer capacity of selected wood species on kinetics of curing reaction. Lower values of said chemical characteristics of a given extractive, resulted in decrease of peak temperature and activation energy, as well as in shorter gel time for a corresponding mixture. Both, DSC measurements of UF adhesive / wood flour mixtures and DEA results of UF adhesive cure in the hot pressed veneer samples, have showed significant influence of wood anatomy structure on curing behavior of UF adhesive.",
publisher = "Univerzitet u Beogradu, Šumarski fakultet",
title = "Očvršćavanje urea-formaldehidnog adheziva za ploče iverice u prisustvu nekih domaćih drvnih vrsta, Curing of urea-formaldehyde adhesive for particleboards in the presence of some domestic wood species",
url = "https://hdl.handle.net/21.15107/rcub_nardus_3510, t-5042"
}

Popović, M. M.. (2012). Očvršćavanje urea-formaldehidnog adheziva za ploče iverice u prisustvu nekih domaćih drvnih vrsta. 
Univerzitet u Beogradu, Šumarski fakultet..
https://hdl.handle.net/21.15107/rcub_nardus_3510

Popović MM. Očvršćavanje urea-formaldehidnog adheziva za ploče iverice u prisustvu nekih domaćih drvnih vrsta. 2012;.
https://hdl.handle.net/21.15107/rcub_nardus_3510 .

Popović, Mlađan M., "Očvršćavanje urea-formaldehidnog adheziva za ploče iverice u prisustvu nekih domaćih drvnih vrsta" (2012),
https://hdl.handle.net/21.15107/rcub_nardus_3510 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Miljković, Jovan
AU  - Budinski-Simendić, Jaroslava
AU  - Pavličević, Jelena
AU  - Ristić, Ivan
PY  - 2011
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/370
AB  - Urea-formaldehyde (UF) resin presents, by far, the most utilized adhesive system in the manufacture of particleboard and fiberboard. At the temperatures above 100 degrees C in the presence of catalyst, this resin undergoes cross-linking reaction and bonding of wood particles in a hot press. In this work the cross-linking of the new type of commercial UF adhesive for E1 type of wood based panels was studied using infra red (IR) spectroscopy and differential scanning calorimetry (DSC). IR spectra of examined UF adhesive showed distinctive characteristics in comparison to the older types of UF adhesives. The influence of different industrial wood species (obtained from beech, fir and poplar) on the curing behavior of wood-flour/adhesive mixtures has been evaluated using DSC method. The peak temperature and enthalpy of the curing reaction were evaluated from scans obtained with different heating rates. The activation energy for the curing reaction of pure adhesive and for wood-flour/adhesive mixtures was calculated using the Kissinger method.
T2  - Wood Research
T1  - Curing characteristics of low emission urea-formaldehyde adhesive in the presence of wood
EP  - 600
IS  - 4
SP  - 589
VL  - 56
UR  - conv_2213
ER  - 

@article{
author = "Popović, Mlađan and Miljković, Jovan and Budinski-Simendić, Jaroslava and Pavličević, Jelena and Ristić, Ivan",
year = "2011",
abstract = "Urea-formaldehyde (UF) resin presents, by far, the most utilized adhesive system in the manufacture of particleboard and fiberboard. At the temperatures above 100 degrees C in the presence of catalyst, this resin undergoes cross-linking reaction and bonding of wood particles in a hot press. In this work the cross-linking of the new type of commercial UF adhesive for E1 type of wood based panels was studied using infra red (IR) spectroscopy and differential scanning calorimetry (DSC). IR spectra of examined UF adhesive showed distinctive characteristics in comparison to the older types of UF adhesives. The influence of different industrial wood species (obtained from beech, fir and poplar) on the curing behavior of wood-flour/adhesive mixtures has been evaluated using DSC method. The peak temperature and enthalpy of the curing reaction were evaluated from scans obtained with different heating rates. The activation energy for the curing reaction of pure adhesive and for wood-flour/adhesive mixtures was calculated using the Kissinger method.",
journal = "Wood Research",
title = "Curing characteristics of low emission urea-formaldehyde adhesive in the presence of wood",
pages = "600-589",
number = "4",
volume = "56",
url = "conv_2213"
}

Popović, M., Miljković, J., Budinski-Simendić, J., Pavličević, J.,& Ristić, I.. (2011). Curing characteristics of low emission urea-formaldehyde adhesive in the presence of wood. in Wood Research, 56(4), 589-600.
conv_2213

Popović M, Miljković J, Budinski-Simendić J, Pavličević J, Ristić I. Curing characteristics of low emission urea-formaldehyde adhesive in the presence of wood. in Wood Research. 2011;56(4):589-600.
conv_2213 .

Popović, Mlađan, Miljković, Jovan, Budinski-Simendić, Jaroslava, Pavličević, Jelena, Ristić, Ivan, "Curing characteristics of low emission urea-formaldehyde adhesive in the presence of wood" in Wood Research, 56, no. 4 (2011):589-600,
conv_2213 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Budinski-Simendić, Jaroslava
AU  - Jovičić, Mirjana
AU  - Mursics, Joszef
AU  - Điporović-Momčilović, Milanka
AU  - Pavličević, Jelena
AU  - Ristić, Ivan
PY  - 2011
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/402
AB  - Metoda diferencijalne skanirajuće kalorimetrije (DSC) upotrebljena je za određivanje kinetike umrežavanja dva komercijalna urea-formaldehidna adheziva sa različitim molskim odnosom formaldehida i uree (F/U). Merenja su obavljena u dinamičkom režimu pri brzinama zagrevanja od 5, 10, 15 i 20°C·min-1. Na osnovu vrednosti temperature maksimuma na egzotermnom piku DSC krive vidi se da adheziv UF1 umrežava na nižim temperaturama (adheziv sa višim molskim odnosom F/U), što odgovara nižoj izračunatoj vrednosti energije aktivacije, Ea, za isti adheziv koja iznosi 73,4 kJ·mol-1 u poređenju sa 77,7 kJ·mol-1 za adheziv UF2. Dobijeni podaci takođe su analizirani pomoću modela izokonverzije OFW (Ozawa-Flynn-Wall) i KAS (Kissinger-Akahira-Sunose). Oba primenjena modela ukazuju na uticaj stepena umrežavanja na energiju aktivacije, pri čemu je KAS kinetički model pokazao nešto niže vrednosti energije aktivacije. Zanimljivo je uočiti različito ponašanje ispitivanih adheziva tokom njihovog umrežavanja. Rezultati ispitivanja pokazuju rast energije aktivacije sa porastom stepena konverzije kod adheziva UF1, dok je konstantno smanjenje Ea tokom reakcije umrežavanja karakteristično za adheziv UF2. Pored navedenog, obavljena su DSC merenja pri različitom dodatku amonijum-hlorida kao katalizatora i pri brzini zagrevanja od 10°C·min-1. Rezultati merenja ukazali su da povećanje dodatka katalizatora od 0,2 do 1,0% utiče na povećanje entalpije reakcije kod adheziva UF2, dok isti uticaj nije zabeležen kod adheziva UF1.
AB  - Differential scanning calorimetry (DSC) was used to evaluate the curing kinetics of two commercial urea-formaldehyde (UF) adhesives having different formaldehyde to urea (F/U) ratio of 1.112 (UF1) and 1.086 (UF2). DSC measurements were done in dynamic scanning regime with heating rates of 5, 10, 15 and 20°C/min in order to determine the activation energy for each adhesive. Obtained data were analyzed using isoconversional methods with application of Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose kinetic models. In addition, different catalyst levels were tested at the heating rate of 10°C/min. The results showed that the adhesive with higher F/U ratio achieved higher activation energy, while having lower peak temperature of curing reaction. It was also noticed that the increase of catalyst level influenced the increase of reaction enthalpy of the adhesive with lower F/U ratio.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Izučavanje kinetike umrežavanja dva komercijalna urea-formaldehidna adheziva primenom metode izokonverzije
T1  - Curing kinetics of two commercial urea-formaldehyde adhesives studied by isoconversional method
EP  - 726
IS  - 6
SP  - 717
VL  - 65
DO  - 10.2298/HEMIND110912088P
UR  - conv_627
ER  - 

@article{
author = "Popović, Mlađan and Budinski-Simendić, Jaroslava and Jovičić, Mirjana and Mursics, Joszef and Điporović-Momčilović, Milanka and Pavličević, Jelena and Ristić, Ivan",
year = "2011",
abstract = "Metoda diferencijalne skanirajuće kalorimetrije (DSC) upotrebljena je za određivanje kinetike umrežavanja dva komercijalna urea-formaldehidna adheziva sa različitim molskim odnosom formaldehida i uree (F/U). Merenja su obavljena u dinamičkom režimu pri brzinama zagrevanja od 5, 10, 15 i 20°C·min-1. Na osnovu vrednosti temperature maksimuma na egzotermnom piku DSC krive vidi se da adheziv UF1 umrežava na nižim temperaturama (adheziv sa višim molskim odnosom F/U), što odgovara nižoj izračunatoj vrednosti energije aktivacije, Ea, za isti adheziv koja iznosi 73,4 kJ·mol-1 u poređenju sa 77,7 kJ·mol-1 za adheziv UF2. Dobijeni podaci takođe su analizirani pomoću modela izokonverzije OFW (Ozawa-Flynn-Wall) i KAS (Kissinger-Akahira-Sunose). Oba primenjena modela ukazuju na uticaj stepena umrežavanja na energiju aktivacije, pri čemu je KAS kinetički model pokazao nešto niže vrednosti energije aktivacije. Zanimljivo je uočiti različito ponašanje ispitivanih adheziva tokom njihovog umrežavanja. Rezultati ispitivanja pokazuju rast energije aktivacije sa porastom stepena konverzije kod adheziva UF1, dok je konstantno smanjenje Ea tokom reakcije umrežavanja karakteristično za adheziv UF2. Pored navedenog, obavljena su DSC merenja pri različitom dodatku amonijum-hlorida kao katalizatora i pri brzini zagrevanja od 10°C·min-1. Rezultati merenja ukazali su da povećanje dodatka katalizatora od 0,2 do 1,0% utiče na povećanje entalpije reakcije kod adheziva UF2, dok isti uticaj nije zabeležen kod adheziva UF1., Differential scanning calorimetry (DSC) was used to evaluate the curing kinetics of two commercial urea-formaldehyde (UF) adhesives having different formaldehyde to urea (F/U) ratio of 1.112 (UF1) and 1.086 (UF2). DSC measurements were done in dynamic scanning regime with heating rates of 5, 10, 15 and 20°C/min in order to determine the activation energy for each adhesive. Obtained data were analyzed using isoconversional methods with application of Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose kinetic models. In addition, different catalyst levels were tested at the heating rate of 10°C/min. The results showed that the adhesive with higher F/U ratio achieved higher activation energy, while having lower peak temperature of curing reaction. It was also noticed that the increase of catalyst level influenced the increase of reaction enthalpy of the adhesive with lower F/U ratio.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Izučavanje kinetike umrežavanja dva komercijalna urea-formaldehidna adheziva primenom metode izokonverzije, Curing kinetics of two commercial urea-formaldehyde adhesives studied by isoconversional method",
pages = "726-717",
number = "6",
volume = "65",
doi = "10.2298/HEMIND110912088P",
url = "conv_627"
}

Popović, M., Budinski-Simendić, J., Jovičić, M., Mursics, J., Điporović-Momčilović, M., Pavličević, J.,& Ristić, I.. (2011). Izučavanje kinetike umrežavanja dva komercijalna urea-formaldehidna adheziva primenom metode izokonverzije. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 65(6), 717-726.
https://doi.org/10.2298/HEMIND110912088P
conv_627

Popović M, Budinski-Simendić J, Jovičić M, Mursics J, Điporović-Momčilović M, Pavličević J, Ristić I. Izučavanje kinetike umrežavanja dva komercijalna urea-formaldehidna adheziva primenom metode izokonverzije. in Hemijska industrija. 2011;65(6):717-726.
doi:10.2298/HEMIND110912088P
conv_627 .

Popović, Mlađan, Budinski-Simendić, Jaroslava, Jovičić, Mirjana, Mursics, Joszef, Điporović-Momčilović, Milanka, Pavličević, Jelena, Ristić, Ivan, "Izučavanje kinetike umrežavanja dva komercijalna urea-formaldehidna adheziva primenom metode izokonverzije" in Hemijska industrija, 65, no. 6 (2011):717-726,
https://doi.org/10.2298/HEMIND110912088P .,
conv_627 .

TY  - JOUR
AU  - Gavrilović-Grmuša, Ivana
AU  - Nesković, Olivera
AU  - Điporović-Momčilović, Milanka
AU  - Popović, Mlađan
PY  - 2010
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/333
AB  - This paper describes some results obtained in an investigation of urea-formaldehyde (UF) resins of different degrees of polymerisation by matrix-assisted laser desorption/ionisation time-of-flight (MALDI-TOF) mass spectrometry (MS). MALDI-TOF MS proved to be an appropriate technique for analyzing these types of polymers, bearing in mind that the results of the analysis correspond with previous physical and chemical measurements. This technique enables a relatively swift determination of the degree of polymerrisation through the monitoring of key changes in the structure of a polymer. Thus, in the analysis of UF resins, it may be possible to monitor a decrease in the intensity of the monohydroxymethyl urea (MMU) signal, which corresponds to an increase of the mass spectra values in the mass range of higher homologues, above 1000 g mol(-1). A noticeable difference concerns the signal intensities in the higher mass ranges (up to 1400 g mol(-1)), which corresponds to more branched and longer homologues of the polymers. Especially, a significantly more intensive signal of MMU was registered. The average molecular weight (MW) of the examined samples was between 936 and 1324 g mol(-1), with a maximal deviation of 20 %, depending on the ratios of the reactants.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Molar-mass distribution of urea-formaldehyde resins of different degrees of polymerisation by MALDI-TOF mass spectrometry
EP  - 699
IS  - 5
SP  - 689
VL  - 75
DO  - 10.2298/JSC091030036G
UR  - conv_908
ER  - 

@article{
author = "Gavrilović-Grmuša, Ivana and Nesković, Olivera and Điporović-Momčilović, Milanka and Popović, Mlađan",
year = "2010",
abstract = "This paper describes some results obtained in an investigation of urea-formaldehyde (UF) resins of different degrees of polymerisation by matrix-assisted laser desorption/ionisation time-of-flight (MALDI-TOF) mass spectrometry (MS). MALDI-TOF MS proved to be an appropriate technique for analyzing these types of polymers, bearing in mind that the results of the analysis correspond with previous physical and chemical measurements. This technique enables a relatively swift determination of the degree of polymerrisation through the monitoring of key changes in the structure of a polymer. Thus, in the analysis of UF resins, it may be possible to monitor a decrease in the intensity of the monohydroxymethyl urea (MMU) signal, which corresponds to an increase of the mass spectra values in the mass range of higher homologues, above 1000 g mol(-1). A noticeable difference concerns the signal intensities in the higher mass ranges (up to 1400 g mol(-1)), which corresponds to more branched and longer homologues of the polymers. Especially, a significantly more intensive signal of MMU was registered. The average molecular weight (MW) of the examined samples was between 936 and 1324 g mol(-1), with a maximal deviation of 20 %, depending on the ratios of the reactants.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Molar-mass distribution of urea-formaldehyde resins of different degrees of polymerisation by MALDI-TOF mass spectrometry",
pages = "699-689",
number = "5",
volume = "75",
doi = "10.2298/JSC091030036G",
url = "conv_908"
}

Gavrilović-Grmuša, I., Nesković, O., Điporović-Momčilović, M.,& Popović, M.. (2010). Molar-mass distribution of urea-formaldehyde resins of different degrees of polymerisation by MALDI-TOF mass spectrometry. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 75(5), 689-699.
https://doi.org/10.2298/JSC091030036G
conv_908

Gavrilović-Grmuša I, Nesković O, Điporović-Momčilović M, Popović M. Molar-mass distribution of urea-formaldehyde resins of different degrees of polymerisation by MALDI-TOF mass spectrometry. in Journal of the Serbian Chemical Society. 2010;75(5):689-699.
doi:10.2298/JSC091030036G
conv_908 .

Gavrilović-Grmuša, Ivana, Nesković, Olivera, Điporović-Momčilović, Milanka, Popović, Mlađan, "Molar-mass distribution of urea-formaldehyde resins of different degrees of polymerisation by MALDI-TOF mass spectrometry" in Journal of the Serbian Chemical Society, 75, no. 5 (2010):689-699,
https://doi.org/10.2298/JSC091030036G .,
conv_908 .

TY  - JOUR
AU  - Điporović-Momčilović, Milanka
AU  - Popović, Mlađan
AU  - Gavrilović-Grmuša, Ivana
AU  - Miljković, Jovan
PY  - 2008
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/242
AB  - Ploča iverica ima izražena higroskopna svojstva, što je čini dimenzionalno nestabilnim materijalom u slučajevima kada je izložena vodi ili u atmosferi sa povećanim sadržajem vlage. Postoji više standardnih metoda ispitivanja debljinskog bubrenja. Cilj ovog rada je usmeren na njihovo upoređenje. U tu svrhu upoređene su tri različite metode za ispitivanje upijanja vode i debljiskog bubrenja: dve koje propisuje nacionalni standard SRPS D.C8.104 i metoda prema evropskom standardu EN 317. Rezultati ispitivanja za oba pomenuta svojstva ukazali su da ne postoje značajne razlike između EN metode zasnovane na epruvetama formata 50×50 mm i SRPS metode zasnovane na upotrebi epruveta 100×100 mm, sugerišući da se obe ove metode mogu alternativno koristiti. Sa druge strane, rezultati dobijeni SRPS metodom uz upotrebu epruveta dimenzija 25×25 mm, znatno su se razlikovali od predhodnih, odnosno ispitivanja po ovoj metodi zabeležila su znatno niže vrednosti debljinskog bubrenja, bez obzira na debljinu ispitivane ploče.
AB  - In regard to its hygroscopic properties, particleboard is dimensionally unstable material when exposed to water or in the atmosphere of high level of humidity. Since today several different standardized methods for determination of thickness swelling exist, the aim of this study was focused on comparison of different testing methods. In this aim, three different methods for determination of water soaking and thickness swelling were compared, two of which were defined by national standard SRPS D.C8.104 and one was defined by European standard EN 317. The results of testing of both properties have shown no significant difference between the EN method based on 50×50 mm test pieces and the SRPS method based on test pieces of 100×100 mm format, suggesting that these two methods can be used alternatively. On the other hand, the results obtained by the SRPS method utilizing the 25×25 mm test pieces, differed significantly from both previous methods. The results were lower for both water soaking and thickness swelling regardless of panel thickness.
PB  - Univerzitet u Beogradu - Šumarski fakultet, Beograd
T2  - Glasnik Šumarskog fakulteta
T1  - Uporedna analiza upijanja i debljinskog bubrenja iverice u zavisnosti od metoda ispitivanja
T1  - Comparative analyses of water soaking and thickness swelling of particleboard versus different test methods
EP  - 74
IS  - 98
SP  - 65
DO  - 10.2298/GSF0898065D
UR  - conv_284
ER  - 

@article{
author = "Điporović-Momčilović, Milanka and Popović, Mlađan and Gavrilović-Grmuša, Ivana and Miljković, Jovan",
year = "2008",
abstract = "Ploča iverica ima izražena higroskopna svojstva, što je čini dimenzionalno nestabilnim materijalom u slučajevima kada je izložena vodi ili u atmosferi sa povećanim sadržajem vlage. Postoji više standardnih metoda ispitivanja debljinskog bubrenja. Cilj ovog rada je usmeren na njihovo upoređenje. U tu svrhu upoređene su tri različite metode za ispitivanje upijanja vode i debljiskog bubrenja: dve koje propisuje nacionalni standard SRPS D.C8.104 i metoda prema evropskom standardu EN 317. Rezultati ispitivanja za oba pomenuta svojstva ukazali su da ne postoje značajne razlike između EN metode zasnovane na epruvetama formata 50×50 mm i SRPS metode zasnovane na upotrebi epruveta 100×100 mm, sugerišući da se obe ove metode mogu alternativno koristiti. Sa druge strane, rezultati dobijeni SRPS metodom uz upotrebu epruveta dimenzija 25×25 mm, znatno su se razlikovali od predhodnih, odnosno ispitivanja po ovoj metodi zabeležila su znatno niže vrednosti debljinskog bubrenja, bez obzira na debljinu ispitivane ploče., In regard to its hygroscopic properties, particleboard is dimensionally unstable material when exposed to water or in the atmosphere of high level of humidity. Since today several different standardized methods for determination of thickness swelling exist, the aim of this study was focused on comparison of different testing methods. In this aim, three different methods for determination of water soaking and thickness swelling were compared, two of which were defined by national standard SRPS D.C8.104 and one was defined by European standard EN 317. The results of testing of both properties have shown no significant difference between the EN method based on 50×50 mm test pieces and the SRPS method based on test pieces of 100×100 mm format, suggesting that these two methods can be used alternatively. On the other hand, the results obtained by the SRPS method utilizing the 25×25 mm test pieces, differed significantly from both previous methods. The results were lower for both water soaking and thickness swelling regardless of panel thickness.",
publisher = "Univerzitet u Beogradu - Šumarski fakultet, Beograd",
journal = "Glasnik Šumarskog fakulteta",
title = "Uporedna analiza upijanja i debljinskog bubrenja iverice u zavisnosti od metoda ispitivanja, Comparative analyses of water soaking and thickness swelling of particleboard versus different test methods",
pages = "74-65",
number = "98",
doi = "10.2298/GSF0898065D",
url = "conv_284"
}

Điporović-Momčilović, M., Popović, M., Gavrilović-Grmuša, I.,& Miljković, J.. (2008). Uporedna analiza upijanja i debljinskog bubrenja iverice u zavisnosti od metoda ispitivanja. in Glasnik Šumarskog fakulteta
Univerzitet u Beogradu - Šumarski fakultet, Beograd.(98), 65-74.
https://doi.org/10.2298/GSF0898065D
conv_284

Điporović-Momčilović M, Popović M, Gavrilović-Grmuša I, Miljković J. Uporedna analiza upijanja i debljinskog bubrenja iverice u zavisnosti od metoda ispitivanja. in Glasnik Šumarskog fakulteta. 2008;(98):65-74.
doi:10.2298/GSF0898065D
conv_284 .

Điporović-Momčilović, Milanka, Popović, Mlađan, Gavrilović-Grmuša, Ivana, Miljković, Jovan, "Uporedna analiza upijanja i debljinskog bubrenja iverice u zavisnosti od metoda ispitivanja" in Glasnik Šumarskog fakulteta, no. 98 (2008):65-74,
https://doi.org/10.2298/GSF0898065D .,
conv_284 .

TY  - JOUR
AU  - Gavrilović-Grmuša, Ivana
AU  - Miljković, Jovan
AU  - Điporović-Momčilović, Milanka
AU  - Popović, Mlađan
PY  - 2008
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/241
AB  - U cilju dobijanja vatrootpornih furnirskih ploča od različitih drvnih sirovina, u ovom istraživanju topolovi furniri su impregnisani rastvorima izabranih vatrootpornih sredstava, a to su: diamonijum fosfat (DF), monoamonijum fosfat (MF), natrijum acetat (NA), vodeno staklo (VS), natrijum tetraborat (NT) i borna kiselina (BK). Da bi se preliminarno odredio dostignuti nivo vatrootpornosti još kod furnira, pre izrade gotovih ploča, primenjene su termogravimetrijska (TG) i derivativna termogravimetrijska (DTG) metoda. TG i DTG analize za tretirano i netretirano drvo kao i za sama vatrootporna sredstva su izvedene na Perkin-Elmer TGS-2 termogravimetrijskom uređaju. Vatrootpornost ploča je testirana prema standardnom testu otpornosti prema dejstvu vatre i kao najefikasnija sredstva su se pokazala isto NT i BK kao i kod TG/DTG analiza, što ukazuje na validnost termogravimetrijske metode u predviđanju uspešnosti vatrootpornog sredstva u budućem proizvodu.
AB  - In the aim to achieve fire-resistant plywood of different wood species, in this study, veneers have been impregnated with solutions of chosen fire retardants, which are diammonium phosphate, monoammonium phosphate, sodium acetate, water glass, sodium tetraborate and boric acid. To determine the preliminary level of fire retardancy achieved in veneers before manufacturing of finished plywood, thermogravimetric (TG) and derivative thermogravimetric (DTG) methods are used. TG and DTG analyses of treated and untreated wood, as well as of fire retardants alone, were performed on a Perkin-Elmer TGS-2 thermogravimetric equipment. Fire resistance of plywood was tested in accordance with standard test for resistance to the effects of fire and the most efficient fire retardants, sodium tetraborate and boric acid had the same results as TG/DTG analyses, which points out the validity of TG methods in predicting success of fire retardants in future products.
PB  - Univerzitet u Beogradu - Šumarski fakultet, Beograd
T2  - Glasnik Šumarskog fakulteta
T1  - Određivanje stepena vatrootpornosti furnirske ploče termogravimetrijom, deo II - topolova furnirska ploča
T1  - Determining the degree of fireretardancy of plywood with thermogravimetry, part II: Poplar plywood
EP  - 64
IS  - 98
SP  - 49
DO  - 10.2298/GSF0898049G
UR  - conv_283
ER  - 

@article{
author = "Gavrilović-Grmuša, Ivana and Miljković, Jovan and Điporović-Momčilović, Milanka and Popović, Mlađan",
year = "2008",
abstract = "U cilju dobijanja vatrootpornih furnirskih ploča od različitih drvnih sirovina, u ovom istraživanju topolovi furniri su impregnisani rastvorima izabranih vatrootpornih sredstava, a to su: diamonijum fosfat (DF), monoamonijum fosfat (MF), natrijum acetat (NA), vodeno staklo (VS), natrijum tetraborat (NT) i borna kiselina (BK). Da bi se preliminarno odredio dostignuti nivo vatrootpornosti još kod furnira, pre izrade gotovih ploča, primenjene su termogravimetrijska (TG) i derivativna termogravimetrijska (DTG) metoda. TG i DTG analize za tretirano i netretirano drvo kao i za sama vatrootporna sredstva su izvedene na Perkin-Elmer TGS-2 termogravimetrijskom uređaju. Vatrootpornost ploča je testirana prema standardnom testu otpornosti prema dejstvu vatre i kao najefikasnija sredstva su se pokazala isto NT i BK kao i kod TG/DTG analiza, što ukazuje na validnost termogravimetrijske metode u predviđanju uspešnosti vatrootpornog sredstva u budućem proizvodu., In the aim to achieve fire-resistant plywood of different wood species, in this study, veneers have been impregnated with solutions of chosen fire retardants, which are diammonium phosphate, monoammonium phosphate, sodium acetate, water glass, sodium tetraborate and boric acid. To determine the preliminary level of fire retardancy achieved in veneers before manufacturing of finished plywood, thermogravimetric (TG) and derivative thermogravimetric (DTG) methods are used. TG and DTG analyses of treated and untreated wood, as well as of fire retardants alone, were performed on a Perkin-Elmer TGS-2 thermogravimetric equipment. Fire resistance of plywood was tested in accordance with standard test for resistance to the effects of fire and the most efficient fire retardants, sodium tetraborate and boric acid had the same results as TG/DTG analyses, which points out the validity of TG methods in predicting success of fire retardants in future products.",
publisher = "Univerzitet u Beogradu - Šumarski fakultet, Beograd",
journal = "Glasnik Šumarskog fakulteta",
title = "Određivanje stepena vatrootpornosti furnirske ploče termogravimetrijom, deo II - topolova furnirska ploča, Determining the degree of fireretardancy of plywood with thermogravimetry, part II: Poplar plywood",
pages = "64-49",
number = "98",
doi = "10.2298/GSF0898049G",
url = "conv_283"
}

Gavrilović-Grmuša, I., Miljković, J., Điporović-Momčilović, M.,& Popović, M.. (2008). Određivanje stepena vatrootpornosti furnirske ploče termogravimetrijom, deo II - topolova furnirska ploča. in Glasnik Šumarskog fakulteta
Univerzitet u Beogradu - Šumarski fakultet, Beograd.(98), 49-64.
https://doi.org/10.2298/GSF0898049G
conv_283

Gavrilović-Grmuša I, Miljković J, Điporović-Momčilović M, Popović M. Određivanje stepena vatrootpornosti furnirske ploče termogravimetrijom, deo II - topolova furnirska ploča. in Glasnik Šumarskog fakulteta. 2008;(98):49-64.
doi:10.2298/GSF0898049G
conv_283 .

Gavrilović-Grmuša, Ivana, Miljković, Jovan, Điporović-Momčilović, Milanka, Popović, Mlađan, "Određivanje stepena vatrootpornosti furnirske ploče termogravimetrijom, deo II - topolova furnirska ploča" in Glasnik Šumarskog fakulteta, no. 98 (2008):49-64,
https://doi.org/10.2298/GSF0898049G .,
conv_283 .

TY  - JOUR
AU  - Miljković, Jovan
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
AU  - Gavrilović-Grmuša, Ivana
PY  - 2007
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/209
AB  - Ovo istraživanje je zasnovano na pretpostavci da promene u veličini i obliku iverja mogu imati uticaj na kvalitet ploče iverice uopšte. Pošto su konvencionalna ploča iverica i ploča iverica od orijentisanog "strend" iverja (OSB) izrađene od sasvim različtog iverja, predstavljaju interesantne predmete poređenja. U ovom radu ispitan je uticaj tipa iverja na ivično držanje vijaka u konvencionalnoj i OSB ploči iverici. Ispitivanja su rađena uz upotrebu vijaka prečnika 4,0, 4,5 i 5,0 mm. Dubina uvrtanja je iznosila 30 mm za sve testove, a vijčani otvori su imali prečnik u opsegu 80-90% u odnosu na prečnik korena vijka. Takođe, obavljena su i ispitivanja debljinskog profila gustine i zatezne čvrstoće upravno na površinu ploče, pošto oba ova svojstva predstavljaju pokazatelje kvaliteta srednjeg sloja ploče u kome je smešteno telo vijka. U cilju boljeg uvida u strukturu srednjeg sloja obavljen je vizuelni pregled površinskog preseka uzorka. U radu su utvrđene značajne razlike između otpornosti prema izvlačenju vijka kod konvencionalne i OSB ploče iverice, pri svim prečnicima vijaka. Pri tome, uzorci OSB-a pokazali su 56-73% veće srednje vrednosti sile izvlačenja u odnosu na konvencionalnu ploču. Sa druge strane, OSB ploča je pokazala veće rasipanje rezultata za sve prečnike vijka, što može dovesti do određenih problema prilikom projektovanja i izrade nameštaja.
AB  - This research was based on presumption that the changes in size and shape of wood particles are expected to have certain impact on the particleboard quality in general. Since the conventional particleboard (PB) and oriented strand board (OSB) were built of the quite diverse wood particles, they present interesting specimens in the comparison tests. In this work, the influence of the wood particles type on the edge screw holding performance of conventional particleboard and OSB was investigated. Those tests were obtained with the screw diameters of 4.0 mm, 4.5 mm and 5 mm. Depth of embedment was 30 mm for all tests and with the pilot-hole diameter kept in the range of 80-90% in respect of the screw root diameter. Additional tests of the thickness density profile and tensile strength perpendicular to the surface of the board were conducted. Since the middle layer structure of the particleboard embeds the screw body, both mentioned parameters are considered important in the aspect of the quality of the edge screw holding performance. In order to have further insight into the conformation of the middle layer the image survey was obtained on the split board section presenting the surface of the middle layer. Significant differences in the SWR performance of OSB and PB was recorded at all screw diameters. For the screw withdrawal tests parameters OSB samples showed 56-73% superior mean values then conventional PB. On the other hand, the OSB showed wider dispersions of measured withdrawal forces at all screw diameters, which might present some of the problems in certain engineering and project calculations.
PB  - Univerzitet u Beogradu - Šumarski fakultet, Beograd
T2  - Glasnik Šumarskog fakulteta
T1  - Otpornost prema ivičnom izvlačenju vijka u konvencionalnoj iverici i OSB ploči - uticaj tipa iverja
T1  - Edge screw withdrawal resistance in conventional particleboard and OSB: Influence of the particles type
EP  - 117
IS  - 95
SP  - 109
DO  - 10.2298/GSF0795109M
UR  - conv_255
ER  - 

@article{
author = "Miljković, Jovan and Popović, Mlađan and Điporović-Momčilović, Milanka and Gavrilović-Grmuša, Ivana",
year = "2007",
abstract = "Ovo istraživanje je zasnovano na pretpostavci da promene u veličini i obliku iverja mogu imati uticaj na kvalitet ploče iverice uopšte. Pošto su konvencionalna ploča iverica i ploča iverica od orijentisanog "strend" iverja (OSB) izrađene od sasvim različtog iverja, predstavljaju interesantne predmete poređenja. U ovom radu ispitan je uticaj tipa iverja na ivično držanje vijaka u konvencionalnoj i OSB ploči iverici. Ispitivanja su rađena uz upotrebu vijaka prečnika 4,0, 4,5 i 5,0 mm. Dubina uvrtanja je iznosila 30 mm za sve testove, a vijčani otvori su imali prečnik u opsegu 80-90% u odnosu na prečnik korena vijka. Takođe, obavljena su i ispitivanja debljinskog profila gustine i zatezne čvrstoće upravno na površinu ploče, pošto oba ova svojstva predstavljaju pokazatelje kvaliteta srednjeg sloja ploče u kome je smešteno telo vijka. U cilju boljeg uvida u strukturu srednjeg sloja obavljen je vizuelni pregled površinskog preseka uzorka. U radu su utvrđene značajne razlike između otpornosti prema izvlačenju vijka kod konvencionalne i OSB ploče iverice, pri svim prečnicima vijaka. Pri tome, uzorci OSB-a pokazali su 56-73% veće srednje vrednosti sile izvlačenja u odnosu na konvencionalnu ploču. Sa druge strane, OSB ploča je pokazala veće rasipanje rezultata za sve prečnike vijka, što može dovesti do određenih problema prilikom projektovanja i izrade nameštaja., This research was based on presumption that the changes in size and shape of wood particles are expected to have certain impact on the particleboard quality in general. Since the conventional particleboard (PB) and oriented strand board (OSB) were built of the quite diverse wood particles, they present interesting specimens in the comparison tests. In this work, the influence of the wood particles type on the edge screw holding performance of conventional particleboard and OSB was investigated. Those tests were obtained with the screw diameters of 4.0 mm, 4.5 mm and 5 mm. Depth of embedment was 30 mm for all tests and with the pilot-hole diameter kept in the range of 80-90% in respect of the screw root diameter. Additional tests of the thickness density profile and tensile strength perpendicular to the surface of the board were conducted. Since the middle layer structure of the particleboard embeds the screw body, both mentioned parameters are considered important in the aspect of the quality of the edge screw holding performance. In order to have further insight into the conformation of the middle layer the image survey was obtained on the split board section presenting the surface of the middle layer. Significant differences in the SWR performance of OSB and PB was recorded at all screw diameters. For the screw withdrawal tests parameters OSB samples showed 56-73% superior mean values then conventional PB. On the other hand, the OSB showed wider dispersions of measured withdrawal forces at all screw diameters, which might present some of the problems in certain engineering and project calculations.",
publisher = "Univerzitet u Beogradu - Šumarski fakultet, Beograd",
journal = "Glasnik Šumarskog fakulteta",
title = "Otpornost prema ivičnom izvlačenju vijka u konvencionalnoj iverici i OSB ploči - uticaj tipa iverja, Edge screw withdrawal resistance in conventional particleboard and OSB: Influence of the particles type",
pages = "117-109",
number = "95",
doi = "10.2298/GSF0795109M",
url = "conv_255"
}

Miljković, J., Popović, M., Điporović-Momčilović, M.,& Gavrilović-Grmuša, I.. (2007). Otpornost prema ivičnom izvlačenju vijka u konvencionalnoj iverici i OSB ploči - uticaj tipa iverja. in Glasnik Šumarskog fakulteta
Univerzitet u Beogradu - Šumarski fakultet, Beograd.(95), 109-117.
https://doi.org/10.2298/GSF0795109M
conv_255

Miljković J, Popović M, Điporović-Momčilović M, Gavrilović-Grmuša I. Otpornost prema ivičnom izvlačenju vijka u konvencionalnoj iverici i OSB ploči - uticaj tipa iverja. in Glasnik Šumarskog fakulteta. 2007;(95):109-117.
doi:10.2298/GSF0795109M
conv_255 .

Miljković, Jovan, Popović, Mlađan, Điporović-Momčilović, Milanka, Gavrilović-Grmuša, Ivana, "Otpornost prema ivičnom izvlačenju vijka u konvencionalnoj iverici i OSB ploči - uticaj tipa iverja" in Glasnik Šumarskog fakulteta, no. 95 (2007):109-117,
https://doi.org/10.2298/GSF0795109M .,
conv_255 .

TY  - JOUR
AU  - Popović, Mlađan
AU  - Điporović-Momčilović, Milanka
AU  - Miljković, Jovan
AU  - Gavrilović-Grmuša, Ivana
PY  - 2006
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/190
AB  - U ovom radu je predstavljen metod za poboljšanje vijčane veze u konvencionalnoj ploči iverici i ploči sa orijentisanim iverjem (OSB). Metod je zasnovan na predhodnom ubrizgavanju odgovarajućeg adheziva u vijčane otvore. Obe ispitivane ploče predstavljaju enterijerne ploče iste nominalne debljine od 18 mm. Ispitivanja su obavljena korišćenjem vijaka za ploče iverice sa navojem po celoj dužini tela vijka i prečnika od 5,0 mm. Vijci su uvrtani ivično u ispitne epruvete, pri čemu je dubina uvrtanja iznosila 30 mm za sva merenja sile izvlačenja. Prečnici vijčanog otvora iznosili su 2,5 mm i 3,0 mm. Odabrani PVAc lepak (tip 3) pomešan sa drvnim puniocem u količiini od 3-10% ubrizgavan je u vijčane otvore. Ispitivanja sile izvlačenja vijka su, takođe, rađena i posle demontaže vijka i naknadnog uvrtanja u cilju ispitivanja montažno-demontažnog karaktera vijčane veze. Ustanovljeno je da ubrizgavanje lepka u vijčane otvore i dodatak drvnog brašna imaju pozitivne efekte na silu ivičnog izvlačenja vijka u ispitivanim pločama.
AB  - This work presents the method for improvement of direct screw connection performance in conventional particleboard (PB) and oriented strand board (OSB). It is conceived on adhesive insertion into the pilot hole prior to embedment of the screw. The tests were carried out on the PB and OSB, both presenting interior boards and with the same nominal thickness of 18 mm. Particleboard screws of the 5 mm in diameter were inserted in the edge of the board. Pilot hole diameters were 2,5 mm and 3,0 mm and the depth of embedment was 30 mm for all tests. The chosen PVAc adhesive (type 3) with the addition of wood flour as consolidator in the range from 3-10% was inserted into pilot-hole. Tests were also obtained after consequent reassembly of the screw connection in order to examine the ratio of loss in withdrawal forces in such case. It was found that the insertion of PVAc adhesive into the pilot hole and the addition of wood flour have the positive effects on the screw withdrawal force in the tested boards.
PB  - Univerzitet u Beogradu - Šumarski fakultet, Beograd
T2  - Glasnik Šumarskog fakulteta
T1  - Poboljšanje ivične vijčane veze u OSB i konvencionalnoj ploči iverici
T1  - The improvement of the edge screw connection in OSB and conventional particleboard
EP  - 266
IS  - 94
SP  - 257
DO  - 10.2298/GSF0694257P
UR  - conv_247
ER  - 

@article{
author = "Popović, Mlađan and Điporović-Momčilović, Milanka and Miljković, Jovan and Gavrilović-Grmuša, Ivana",
year = "2006",
abstract = "U ovom radu je predstavljen metod za poboljšanje vijčane veze u konvencionalnoj ploči iverici i ploči sa orijentisanim iverjem (OSB). Metod je zasnovan na predhodnom ubrizgavanju odgovarajućeg adheziva u vijčane otvore. Obe ispitivane ploče predstavljaju enterijerne ploče iste nominalne debljine od 18 mm. Ispitivanja su obavljena korišćenjem vijaka za ploče iverice sa navojem po celoj dužini tela vijka i prečnika od 5,0 mm. Vijci su uvrtani ivično u ispitne epruvete, pri čemu je dubina uvrtanja iznosila 30 mm za sva merenja sile izvlačenja. Prečnici vijčanog otvora iznosili su 2,5 mm i 3,0 mm. Odabrani PVAc lepak (tip 3) pomešan sa drvnim puniocem u količiini od 3-10% ubrizgavan je u vijčane otvore. Ispitivanja sile izvlačenja vijka su, takođe, rađena i posle demontaže vijka i naknadnog uvrtanja u cilju ispitivanja montažno-demontažnog karaktera vijčane veze. Ustanovljeno je da ubrizgavanje lepka u vijčane otvore i dodatak drvnog brašna imaju pozitivne efekte na silu ivičnog izvlačenja vijka u ispitivanim pločama., This work presents the method for improvement of direct screw connection performance in conventional particleboard (PB) and oriented strand board (OSB). It is conceived on adhesive insertion into the pilot hole prior to embedment of the screw. The tests were carried out on the PB and OSB, both presenting interior boards and with the same nominal thickness of 18 mm. Particleboard screws of the 5 mm in diameter were inserted in the edge of the board. Pilot hole diameters were 2,5 mm and 3,0 mm and the depth of embedment was 30 mm for all tests. The chosen PVAc adhesive (type 3) with the addition of wood flour as consolidator in the range from 3-10% was inserted into pilot-hole. Tests were also obtained after consequent reassembly of the screw connection in order to examine the ratio of loss in withdrawal forces in such case. It was found that the insertion of PVAc adhesive into the pilot hole and the addition of wood flour have the positive effects on the screw withdrawal force in the tested boards.",
publisher = "Univerzitet u Beogradu - Šumarski fakultet, Beograd",
journal = "Glasnik Šumarskog fakulteta",
title = "Poboljšanje ivične vijčane veze u OSB i konvencionalnoj ploči iverici, The improvement of the edge screw connection in OSB and conventional particleboard",
pages = "266-257",
number = "94",
doi = "10.2298/GSF0694257P",
url = "conv_247"
}

Popović, M., Điporović-Momčilović, M., Miljković, J.,& Gavrilović-Grmuša, I.. (2006). Poboljšanje ivične vijčane veze u OSB i konvencionalnoj ploči iverici. in Glasnik Šumarskog fakulteta
Univerzitet u Beogradu - Šumarski fakultet, Beograd.(94), 257-266.
https://doi.org/10.2298/GSF0694257P
conv_247

Popović M, Điporović-Momčilović M, Miljković J, Gavrilović-Grmuša I. Poboljšanje ivične vijčane veze u OSB i konvencionalnoj ploči iverici. in Glasnik Šumarskog fakulteta. 2006;(94):257-266.
doi:10.2298/GSF0694257P
conv_247 .

Popović, Mlađan, Điporović-Momčilović, Milanka, Miljković, Jovan, Gavrilović-Grmuša, Ivana, "Poboljšanje ivične vijčane veze u OSB i konvencionalnoj ploči iverici" in Glasnik Šumarskog fakulteta, no. 94 (2006):257-266,
https://doi.org/10.2298/GSF0694257P .,
conv_247 .