
Mechanism of formation and heatresistant properties of poly(isocyanurate-oxazolidone) modified rigid polyurethane foams
GUO YaMing;YUAN HongFu;WANG HaiQiao;HE LiFan;LI XiaoYu
Journal of Beijing University of Chemical Technology ›› 2012, Vol. 39 ›› Issue (6) : 63-68.
Mechanism of formation and heatresistant properties of poly(isocyanurate-oxazolidone) modified rigid polyurethane foams
Isocyanurate-oxazolidone modified rigid polyurethane foams, based on polyurethane and epoxy resin, have been prepared by a simultaneous polymerization technique. The changes in the chemical structure were investigated by Fourier transform infrared (FT-IR) spectroscopy, and the thermal properties of the foams were evaluated by dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). FT-IR spectroscopy showed that urethane and isocyanurate (IS) structures were formed initially, and were then transformed into oxazolidone (OX) by reaction with the epoxy resin. The introduction of IS and OX raises the glass transition temperature Tg and significantly improves the heat-resistant properties of the foams.
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