聚(异氰脲酸酯-噁唑烷酮)改性硬质聚氨酯泡沫的反应机理及其耐热性能研究

Mechanism of formation and heat-resistant properties of poly(isocyanurate-oxazolidone) modified rigid polyurethane foams

用一步法制备出聚异氰脲酸酯-噁唑烷酮改性硬质聚氨酯泡沫(PISOX-RPUF),使用FT-IR对反应历程进行定性与半定量研究,并运用DMA、TG表征了PISOX-RPUF的耐高温性能。结果表明,在一定的条件下,体系首先生成氨基甲酸酯与异氰脲酸酯六元环(IS)结构,然后它们再分别与环氧树脂反应生成噁唑烷酮(OX)结构;泡沫中IS环与OX环结构的引入,显著提高了PISOX-RPUF的玻璃化转变温度和热稳定性。

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.