TY  - JOUR
AU  - Petković, Branka B.
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Dekić, Biljana
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/333
AB  - In order to minimize emission of formaldehyde from urea formaldehyde resins (UF) and to improve their thermo-oxidative behavior, the effect of low gamma-irradiation on hydrolytic and thermo-oxidative stability of nano-silica modified UF resin, modified UF resin with wood flour (Pinus silvestris L.) as natural filler and modified UF resin with mixture of SiO2/WF fillers were investigated. The hydrolytic stability of modified UF resins was determined by measuring the mass loss and liberated formaldehyde concentration of modified UF resins after acid hydrolysis. The studied modified UF resins have been irradiated (50 kGy) and effect of gamma-irradiation was evaluated on the basis of percentage of liberated formaldehyde before and after irradiation. The minimum percentage (1.23%) of liberated formaldehyde and mass loss of a 25.35% were obtained in wood flour modified UF resin after 7-irradiation which indicate significant improvement in the hydrolytic stability compared to other modified UF resins. The effect of gamma-irradiation was evaluated also on the basis of thermo-oxidative behavior of the same modified UF resins before and after irradiation. The thermo-oxidative behavior was studied by non-isothermal thermo-gravimetric analysis (TG), differential thermo-gravimetly (DTG) and differential thermal analysis (DTA) supported by data from IR spectroscopy. After gamma-irradiation, the shift of DTA peaks a higher temperature indicates that thermo-oxidative stability of modified UF/SiO2/WF is increase. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Composites: Part B: Engineering
T1  - Effect of gamma-irradiation on the hydrolytic stability and thermo-oxidative behavior of bio/inorganic modified urea-formaldehyde resins
VL  - 69
SP  - 397
EP  - 405
DO  - 10.1016/j.compositesb.2014.10.033
ER  - 

@article{
author = "Petković, Branka B. and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Dekić, Biljana and Marković, Gordana and Marinović-Cincović, Milena",
year = "2015",
abstract = "In order to minimize emission of formaldehyde from urea formaldehyde resins (UF) and to improve their thermo-oxidative behavior, the effect of low gamma-irradiation on hydrolytic and thermo-oxidative stability of nano-silica modified UF resin, modified UF resin with wood flour (Pinus silvestris L.) as natural filler and modified UF resin with mixture of SiO2/WF fillers were investigated. The hydrolytic stability of modified UF resins was determined by measuring the mass loss and liberated formaldehyde concentration of modified UF resins after acid hydrolysis. The studied modified UF resins have been irradiated (50 kGy) and effect of gamma-irradiation was evaluated on the basis of percentage of liberated formaldehyde before and after irradiation. The minimum percentage (1.23%) of liberated formaldehyde and mass loss of a 25.35% were obtained in wood flour modified UF resin after 7-irradiation which indicate significant improvement in the hydrolytic stability compared to other modified UF resins. The effect of gamma-irradiation was evaluated also on the basis of thermo-oxidative behavior of the same modified UF resins before and after irradiation. The thermo-oxidative behavior was studied by non-isothermal thermo-gravimetric analysis (TG), differential thermo-gravimetly (DTG) and differential thermal analysis (DTA) supported by data from IR spectroscopy. After gamma-irradiation, the shift of DTA peaks a higher temperature indicates that thermo-oxidative stability of modified UF/SiO2/WF is increase. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Composites: Part B: Engineering",
title = "Effect of gamma-irradiation on the hydrolytic stability and thermo-oxidative behavior of bio/inorganic modified urea-formaldehyde resins",
volume = "69",
pages = "397-405",
doi = "10.1016/j.compositesb.2014.10.033"
}

Petković, B. B., Samaržija-Jovanović, S., Jovanović, V., Dekić, B., Marković, G.,& Marinović-Cincović, M.. (2015). Effect of gamma-irradiation on the hydrolytic stability and thermo-oxidative behavior of bio/inorganic modified urea-formaldehyde resins. in Composites: Part B: Engineering, 69, 397-405.
https://doi.org/10.1016/j.compositesb.2014.10.033

Petković BB, Samaržija-Jovanović S, Jovanović V, Dekić B, Marković G, Marinović-Cincović M. Effect of gamma-irradiation on the hydrolytic stability and thermo-oxidative behavior of bio/inorganic modified urea-formaldehyde resins. in Composites: Part B: Engineering. 2015;69:397-405.
doi:10.1016/j.compositesb.2014.10.033 .

Petković, Branka B., Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Dekić, Biljana, Marković, Gordana, Marinović-Cincović, Milena, "Effect of gamma-irradiation on the hydrolytic stability and thermo-oxidative behavior of bio/inorganic modified urea-formaldehyde resins" in Composites: Part B: Engineering, 69 (2015):397-405,
https://doi.org/10.1016/j.compositesb.2014.10.033 . .

TY  - JOUR
AU  - Dekic, Biljana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Dekic, Vidoslav
AU  - Radulovic, Niko
AU  - Simonovic, Ranko
AU  - Marinović-Cincović, Milena
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5865
AB  - Thermal behavior of structurally similar 4-arylamino-3-nitrocoumarin derivatives substituted with different electron-donor and electron-acceptor substituents on the aryl side group was investigated. The thermal stability of these compounds was studied by non-isothermal thermo-gravimetric analysis, differential thermo-gravimetry, differential thermal analysis, and pyrolysis-gas chromatography-mass spectrometry. The thermal degradation of the three synthesized 4-arylamino-3-nitrocoumarins, possessing an iodine atom, a nitro or a methyl group, proceeds in three steps. The thermal stability of the coumarin derivative with the electron-donating methyl substituent is lower than that of the compounds with the electron-accepting nitro group or iodine atom. This least stable compound (4-[(4-methylphenyl)amino]-3-nitro-2H-chromen-2-one) was also characterized with the greatest loss in mass that accompanied the degradation, and all of the three degradation steps of this compound began at the lowest temperature in comparison to the other two.
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Influence of the aryl substituent identity in 4-arylamino-3-nitrocoumarins on their thermal behavior
VL  - 115
IS  - 2
SP  - 1619
EP  - 1626
DO  - 10.1007/s10973-013-3357-z
ER  - 

@article{
author = "Dekic, Biljana and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Dekic, Vidoslav and Radulovic, Niko and Simonovic, Ranko and Marinović-Cincović, Milena",
year = "2014",
abstract = "Thermal behavior of structurally similar 4-arylamino-3-nitrocoumarin derivatives substituted with different electron-donor and electron-acceptor substituents on the aryl side group was investigated. The thermal stability of these compounds was studied by non-isothermal thermo-gravimetric analysis, differential thermo-gravimetry, differential thermal analysis, and pyrolysis-gas chromatography-mass spectrometry. The thermal degradation of the three synthesized 4-arylamino-3-nitrocoumarins, possessing an iodine atom, a nitro or a methyl group, proceeds in three steps. The thermal stability of the coumarin derivative with the electron-donating methyl substituent is lower than that of the compounds with the electron-accepting nitro group or iodine atom. This least stable compound (4-[(4-methylphenyl)amino]-3-nitro-2H-chromen-2-one) was also characterized with the greatest loss in mass that accompanied the degradation, and all of the three degradation steps of this compound began at the lowest temperature in comparison to the other two.",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Influence of the aryl substituent identity in 4-arylamino-3-nitrocoumarins on their thermal behavior",
volume = "115",
number = "2",
pages = "1619-1626",
doi = "10.1007/s10973-013-3357-z"
}

Dekic, B., Samaržija-Jovanović, S., Jovanović, V., Dekic, V., Radulovic, N., Simonovic, R.,& Marinović-Cincović, M.. (2014). Influence of the aryl substituent identity in 4-arylamino-3-nitrocoumarins on their thermal behavior. in Journal of Thermal Analysis and Calorimetry, 115(2), 1619-1626.
https://doi.org/10.1007/s10973-013-3357-z

Dekic B, Samaržija-Jovanović S, Jovanović V, Dekic V, Radulovic N, Simonovic R, Marinović-Cincović M. Influence of the aryl substituent identity in 4-arylamino-3-nitrocoumarins on their thermal behavior. in Journal of Thermal Analysis and Calorimetry. 2014;115(2):1619-1626.
doi:10.1007/s10973-013-3357-z .

Dekic, Biljana, Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Dekic, Vidoslav, Radulovic, Niko, Simonovic, Ranko, Marinović-Cincović, Milena, "Influence of the aryl substituent identity in 4-arylamino-3-nitrocoumarins on their thermal behavior" in Journal of Thermal Analysis and Calorimetry, 115, no. 2 (2014):1619-1626,
https://doi.org/10.1007/s10973-013-3357-z . .

TY  - JOUR
AU  - Jovanović, Vojislav
AU  - Samaržija-Jovanović, Suzana
AU  - Dekic, Biljana
AU  - Dekic, Vidoslav
AU  - Marinović-Cincović, Milena
AU  - Marković, Gordana
AU  - Konstaninovic, Sandra
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5930
AB  - Two types of nanosilica-based urea-formaldehyde (UF) hybrid materials with formaldehyde to urea (F/U) ratio (0.8) were synthesized without (UF + SiO2) and with coumarin (4-chloro-3-nitro-2H-chromen-2-one). Obtained composites have been irradiated (50 kGy) and their radiation stability was evaluated on the basis of thermal behavior before and after irradiation. The thermal properties of materials were studied by nonisothermal thermogravimetric analysis, differential thermal gravimetry, differential thermal analysis and differential scanning calorimetry supported by data from infrared spectroscopy. The free formaldehyde percentage was determined for all prepared samples. The shift of temperature values for selected mass loss to a high temperature indicates the increase in thermal stability of materials with coumarin after gamma-irradiation. The free formaldehyde percentage was reduced after irradiation from 15% to 3% for sample without coumarin and from 7% to 4% for sample with coumarin. The asymmetric stretching vibrations of -N-CH2-N- absorption band and nu(as)(Si-O) of siloxane or silicone in FTIR spectra of irradiated coumarin compound are shifted to higher wave number values and confirmed its higher thermal stability.
T2  - Journal of Thermoplastic Composite Materials
T1  - The effect of gamma-irradiation on thermal behavior of composites based on nanosilica and 4-chloro-3-nitro-2H-chromen-2-one-modified urea-formaldehyde
VL  - 27
IS  - 5
SP  - 632
EP  - 649
DO  - 10.1177/0892705712453156
ER  - 

@article{
author = "Jovanović, Vojislav and Samaržija-Jovanović, Suzana and Dekic, Biljana and Dekic, Vidoslav and Marinović-Cincović, Milena and Marković, Gordana and Konstaninovic, Sandra",
year = "2014",
abstract = "Two types of nanosilica-based urea-formaldehyde (UF) hybrid materials with formaldehyde to urea (F/U) ratio (0.8) were synthesized without (UF + SiO2) and with coumarin (4-chloro-3-nitro-2H-chromen-2-one). Obtained composites have been irradiated (50 kGy) and their radiation stability was evaluated on the basis of thermal behavior before and after irradiation. The thermal properties of materials were studied by nonisothermal thermogravimetric analysis, differential thermal gravimetry, differential thermal analysis and differential scanning calorimetry supported by data from infrared spectroscopy. The free formaldehyde percentage was determined for all prepared samples. The shift of temperature values for selected mass loss to a high temperature indicates the increase in thermal stability of materials with coumarin after gamma-irradiation. The free formaldehyde percentage was reduced after irradiation from 15% to 3% for sample without coumarin and from 7% to 4% for sample with coumarin. The asymmetric stretching vibrations of -N-CH2-N- absorption band and nu(as)(Si-O) of siloxane or silicone in FTIR spectra of irradiated coumarin compound are shifted to higher wave number values and confirmed its higher thermal stability.",
journal = "Journal of Thermoplastic Composite Materials",
title = "The effect of gamma-irradiation on thermal behavior of composites based on nanosilica and 4-chloro-3-nitro-2H-chromen-2-one-modified urea-formaldehyde",
volume = "27",
number = "5",
pages = "632-649",
doi = "10.1177/0892705712453156"
}

Jovanović, V., Samaržija-Jovanović, S., Dekic, B., Dekic, V., Marinović-Cincović, M., Marković, G.,& Konstaninovic, S.. (2014). The effect of gamma-irradiation on thermal behavior of composites based on nanosilica and 4-chloro-3-nitro-2H-chromen-2-one-modified urea-formaldehyde. in Journal of Thermoplastic Composite Materials, 27(5), 632-649.
https://doi.org/10.1177/0892705712453156

Jovanović V, Samaržija-Jovanović S, Dekic B, Dekic V, Marinović-Cincović M, Marković G, Konstaninovic S. The effect of gamma-irradiation on thermal behavior of composites based on nanosilica and 4-chloro-3-nitro-2H-chromen-2-one-modified urea-formaldehyde. in Journal of Thermoplastic Composite Materials. 2014;27(5):632-649.
doi:10.1177/0892705712453156 .

Jovanović, Vojislav, Samaržija-Jovanović, Suzana, Dekic, Biljana, Dekic, Vidoslav, Marinović-Cincović, Milena, Marković, Gordana, Konstaninovic, Sandra, "The effect of gamma-irradiation on thermal behavior of composites based on nanosilica and 4-chloro-3-nitro-2H-chromen-2-one-modified urea-formaldehyde" in Journal of Thermoplastic Composite Materials, 27, no. 5 (2014):632-649,
https://doi.org/10.1177/0892705712453156 . .

TY  - JOUR
AU  - Jovanović, Vojislav
AU  - Samaržija-Jovanović, Suzana
AU  - Dekic, Biljana
AU  - Dekic, Vidoslav
AU  - Konstaninovic, Sandra
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5286
AB  - Two types of nano-silica based urea-formaldehyde (UF) hybrid composite materials with formaldehyde to urea (F/U) ratio (0.8) were synthesized without (UF + SiO2) and with coumarin (UF + SiO2 + 4-chloro-3-nitro-2H-chromen-2-one). Nano-silica based UF hybrid composites have been irradiated (50 kGy) and effect of gamma-irradiation was evaluated on the basis of thermo-oxidative behavior before and after irradiation. The thermo-oxidative behavior of materials was studied by non-isothermal thermo-gravimetric analysis (TG), differential thermo-gravimetry (DTG) and differential thermal analysis (DTA) supported by data from IR spectroscopy. After gamma-irradiation, the shift of temperature values for selected mass loss to a higher temperature indicates that thermo-oxidative stability of modified nano-silica based UF resin with coumarin 4-chloro-3-nitro-2H-chromen-2-one is increase. (c) 2012 Elsevier Ltd. All rights reserved.
T2  - Composites: Part B: Engineering
T1  - Effect of gamma-irradiation on the thermo-oxidative behavior of nano-silica based urea-formaldehyde hybrid composite with 4-chloro-3-nitro-2H-chromen-2-one
VL  - 45
IS  - 1
SP  - 864
EP  - 870
DO  - 10.1016/j.compositesb.2012.07.025
ER  - 

@article{
author = "Jovanović, Vojislav and Samaržija-Jovanović, Suzana and Dekic, Biljana and Dekic, Vidoslav and Konstaninovic, Sandra and Marković, Gordana and Marinović-Cincović, Milena",
year = "2013",
abstract = "Two types of nano-silica based urea-formaldehyde (UF) hybrid composite materials with formaldehyde to urea (F/U) ratio (0.8) were synthesized without (UF + SiO2) and with coumarin (UF + SiO2 + 4-chloro-3-nitro-2H-chromen-2-one). Nano-silica based UF hybrid composites have been irradiated (50 kGy) and effect of gamma-irradiation was evaluated on the basis of thermo-oxidative behavior before and after irradiation. The thermo-oxidative behavior of materials was studied by non-isothermal thermo-gravimetric analysis (TG), differential thermo-gravimetry (DTG) and differential thermal analysis (DTA) supported by data from IR spectroscopy. After gamma-irradiation, the shift of temperature values for selected mass loss to a higher temperature indicates that thermo-oxidative stability of modified nano-silica based UF resin with coumarin 4-chloro-3-nitro-2H-chromen-2-one is increase. (c) 2012 Elsevier Ltd. All rights reserved.",
journal = "Composites: Part B: Engineering",
title = "Effect of gamma-irradiation on the thermo-oxidative behavior of nano-silica based urea-formaldehyde hybrid composite with 4-chloro-3-nitro-2H-chromen-2-one",
volume = "45",
number = "1",
pages = "864-870",
doi = "10.1016/j.compositesb.2012.07.025"
}

Jovanović, V., Samaržija-Jovanović, S., Dekic, B., Dekic, V., Konstaninovic, S., Marković, G.,& Marinović-Cincović, M.. (2013). Effect of gamma-irradiation on the thermo-oxidative behavior of nano-silica based urea-formaldehyde hybrid composite with 4-chloro-3-nitro-2H-chromen-2-one. in Composites: Part B: Engineering, 45(1), 864-870.
https://doi.org/10.1016/j.compositesb.2012.07.025

Jovanović V, Samaržija-Jovanović S, Dekic B, Dekic V, Konstaninovic S, Marković G, Marinović-Cincović M. Effect of gamma-irradiation on the thermo-oxidative behavior of nano-silica based urea-formaldehyde hybrid composite with 4-chloro-3-nitro-2H-chromen-2-one. in Composites: Part B: Engineering. 2013;45(1):864-870.
doi:10.1016/j.compositesb.2012.07.025 .

Jovanović, Vojislav, Samaržija-Jovanović, Suzana, Dekic, Biljana, Dekic, Vidoslav, Konstaninovic, Sandra, Marković, Gordana, Marinović-Cincović, Milena, "Effect of gamma-irradiation on the thermo-oxidative behavior of nano-silica based urea-formaldehyde hybrid composite with 4-chloro-3-nitro-2H-chromen-2-one" in Composites: Part B: Engineering, 45, no. 1 (2013):864-870,
https://doi.org/10.1016/j.compositesb.2012.07.025 . .