Effect of γ-irradiation on the hydrolytic and thermal stability of micro- and nano-TiO2 based urea–formaldehyde composites
作者： V. Jovanović , S. Samaržija-Jovanović , B. Petković , V. Dekić , G. Marković
DOI: 10.1039/C5RA10627C
关键词: Differential thermal analysis 、 Polymerization 、 Attenuated total reflection 、 Irradiation 、 Composite material 、 Hydrolysis 、 Thermal stability 、 Urea-formaldehyde 、 Materials science 、 Formaldehyde
摘要: The hydrolytic stability and thermal behavior of organic–inorganic composites prepared by two-stage polymerization urea–formaldehyde resin (UF) with micro- nano-TiO2 before after irradiation has been investigated. Composites particles TiO2 different sizes were synthesized, namely: UF/micro-TiO2 UF/nano-TiO2. the modified UF was determined measuring mass loss liberated formaldehyde concentration acid hydrolysis. studied have irradiated (50 kGy) effect γ-irradiation evaluated on basis percentage irradiation. minimum (0.16%) obtained in which indicated a significant improvement compared micro-TiO2 (0.52%). also same non-isothermal thermo-gravimetric analysis (TG), differential thermo-gravimetry (DTG) (DTA) supported data from attenuated total reflection infrared (ATR-IR) spectroscopy. DTG peaks both are shifted to higher temperature irradiation, but shows less change than nano-TiO2. In other words, better radiation stability. Gamma causes minor ATR-IR spectra, specifically decrease intensities some bands.
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