UV-curing of hyperbranched polyurethane acrylate-polyurethane diacrylate/SiO₂ dispersion and TGA/FTIR study of cured films

Abstract

UV-curable hyperbranched polyurethane acrylate-polyurethane diacrylate/SiO₂ dispersion (HBPUA-PUDA/SiO₂) was prepared with isophorone diisocyanate (IPDI), hyperbranched polyester Boltorn H20 (H20), hydroxy-ethyl acrylate (HEA), polyethyleneglycol (PEG-200) and nano-SiO₂. The UV curing kinetics of the films was investigated by FTIR. The results show that the curing speed of the films increases with the adding of nano-SiO₂ and decreases with the adding of PUDA due to the slower chain movement. The thermal stability of the HBPUA-PUDA/SiO₂ films was studied by using thermogravimetric analysis coupled with Fourier transform infrared spectroscopy (TGA/FTIR). The results show that all films exhibit two degradation stages located at about 320 and 440 °C corresponding to the degradation for hard segments of urethane-acrylate and the degradation for soft segment and polyester core. In addition, the results from the analysis of TGA/FTIR also indicate that the decomposition temperature of HBPUA-PUDA/SiO₂ film is 15 °C higher than that obtained for pure polymer. The degradation mechanism was proposed according to TGA/FTIR results.

Keywords

UV-curing / hyperbranched polyurethane acrylate / urethane diacrylate / TGA/FTIR / thermal degradation

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