Preparation, combustion and thermal behaviors of UV-cured coatings containing organically modified α-ZrP
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The bisphenol A epoxy acrylate resin containing a small amount of organically modified alpha-zirconium phosphate (α-ZrP) was cured within seconds upon UV irradiation at ambient temperature. The UV–curing behavior was investigated by fourier transformedinfrared spectroscopy (FTIR). The microstructures were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The transparency and the combustion were examined by the UV–vis transmission spectra and Microscale Combustion Calorimeter (MCC), respectively. The ultraviolet–visible spectra of the cured films showed no obvious absorbance over a range of 400–800 nm, which revealed that the cured films were transparent. The results of MCC revealed that heat release rate (HRR) of the films decreased with the contents of organic α-ZrP (OZrP). Thermal behavior of the cured films was studied by thermogravimetric analysis (TGA), which indicated that with increasing the contents of OZrP, the char yields of UV-cured films were enhanced. Viscoelastic property of photocured nanocomposites was evaluated by dynamic-mechanical analysis. The effects of OZrP on the properties of UV curable films were critically evaluated in this paper.
KeywordsUV-cured Nanocomposite Combustion Thermal behavior OZrP
The work was supported by the Program for Specialized Research Fund for the Doctoral Program of Higher Education (200803580008), the Program for Science and Technology of SuZhou (SG-0841), the Opening Project of State Key Laboratory of Environmental Adaptability for Industrial Product and the Program for the graduate innovation fund in University of Science and Technology of China.
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