TY  - JOUR
AU  - Jovanović, Vojislav
AU  - Samaržija-Jovanović, Suzana
AU  - Petković, Branka B.
AU  - Dekić, Vidoslav
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/656
AB  - The hydrolytic stability and thermal behavior of organic-inorganic composites prepared by two-stage polymerization of urea-formaldehyde resin (UF) with micro-and nano-TiO2 before and after irradiation has been investigated. Composites of urea-formaldehyde and particles of TiO2 of different sizes were synthesized, namely: UF/micro-TiO2 and UF/nano-TiO2. The hydrolytic stability of the modified UF composites was determined by measuring the mass loss and liberated formaldehyde concentration of modified UF composites after acid hydrolysis. The studied modified UF composites have been irradiated (50 kGy) and the effect of gamma-irradiation was evaluated on the basis of the percentage of liberated formaldehyde before and after irradiation. The minimum percentage (0.16%) of liberated formaldehyde was obtained in nano-TiO2 modified UF resin after gamma-irradiation which indicated a significant improvement in the hydrolytic stability compared with micro-TiO2 modified UF resin (0.52%). The effect of gamma-irradiation was evaluated also on the basis of the thermal behavior of the same modified UF composites before and after irradiation. The thermal behavior was studied by non-isothermal thermogravimetric analysis (TG), differential thermo-gravimetry (DTG) and differential thermal analysis (DTA) supported by data from attenuated total reflection infrared (ATR-IR) spectroscopy. DTG peaks of both composites are shifted to a higher temperature after irradiation, but UF/micro-TiO2 after gamma-irradiation shows less change in the thermal behavior than nano-TiO2. In other words, UF/micro-TiO2 shows better radiation stability. Gamma irradiation causes a minor effect on the ATR-IR spectra, specifically the decrease of the intensities of some bands.
T2  - RSC Advances
T1  - Effect of gamma-irradiation on the hydrolytic and thermal stability of micro- and nano-TiO2 based urea-formaldehyde composites
VL  - 5
IS  - 73
SP  - 59715
EP  - 59722
DO  - 10.1039/c5ra10627c
ER  - 

@article{
author = "Jovanović, Vojislav and Samaržija-Jovanović, Suzana and Petković, Branka B. and Dekić, Vidoslav and Marković, Gordana and Marinović-Cincović, Milena",
year = "2015",
abstract = "The hydrolytic stability and thermal behavior of organic-inorganic composites prepared by two-stage polymerization of urea-formaldehyde resin (UF) with micro-and nano-TiO2 before and after irradiation has been investigated. Composites of urea-formaldehyde and particles of TiO2 of different sizes were synthesized, namely: UF/micro-TiO2 and UF/nano-TiO2. The hydrolytic stability of the modified UF composites was determined by measuring the mass loss and liberated formaldehyde concentration of modified UF composites after acid hydrolysis. The studied modified UF composites have been irradiated (50 kGy) and the effect of gamma-irradiation was evaluated on the basis of the percentage of liberated formaldehyde before and after irradiation. The minimum percentage (0.16%) of liberated formaldehyde was obtained in nano-TiO2 modified UF resin after gamma-irradiation which indicated a significant improvement in the hydrolytic stability compared with micro-TiO2 modified UF resin (0.52%). The effect of gamma-irradiation was evaluated also on the basis of the thermal behavior of the same modified UF composites before and after irradiation. The thermal behavior was studied by non-isothermal thermogravimetric analysis (TG), differential thermo-gravimetry (DTG) and differential thermal analysis (DTA) supported by data from attenuated total reflection infrared (ATR-IR) spectroscopy. DTG peaks of both composites are shifted to a higher temperature after irradiation, but UF/micro-TiO2 after gamma-irradiation shows less change in the thermal behavior than nano-TiO2. In other words, UF/micro-TiO2 shows better radiation stability. Gamma irradiation causes a minor effect on the ATR-IR spectra, specifically the decrease of the intensities of some bands.",
journal = "RSC Advances",
title = "Effect of gamma-irradiation on the hydrolytic and thermal stability of micro- and nano-TiO2 based urea-formaldehyde composites",
volume = "5",
number = "73",
pages = "59715-59722",
doi = "10.1039/c5ra10627c"
}

Jovanović, V., Samaržija-Jovanović, S., Petković, B. B., Dekić, V., Marković, G.,& Marinović-Cincović, M.. (2015). Effect of gamma-irradiation on the hydrolytic and thermal stability of micro- and nano-TiO2 based urea-formaldehyde composites. in RSC Advances, 5(73), 59715-59722.
https://doi.org/10.1039/c5ra10627c

Jovanović V, Samaržija-Jovanović S, Petković BB, Dekić V, Marković G, Marinović-Cincović M. Effect of gamma-irradiation on the hydrolytic and thermal stability of micro- and nano-TiO2 based urea-formaldehyde composites. in RSC Advances. 2015;5(73):59715-59722.
doi:10.1039/c5ra10627c .

Jovanović, Vojislav, Samaržija-Jovanović, Suzana, Petković, Branka B., Dekić, Vidoslav, Marković, Gordana, Marinović-Cincović, Milena, "Effect of gamma-irradiation on the hydrolytic and thermal stability of micro- and nano-TiO2 based urea-formaldehyde composites" in RSC Advances, 5, no. 73 (2015):59715-59722,
https://doi.org/10.1039/c5ra10627c . .