热塑性聚氨酯-聚酰亚胺合金的制备及其性质研究

众所周知，聚氨酯弹性体（ＰＵ）具有橡胶和塑料的优良性能，它们耐磨、耐低温、柔韧性好，目前已发展成为一类很重要的工程材料［１，２］．然而由于用普通方法制备的聚氨酯耐高温性能不好，当它们加热到８０～９０℃时，一些实用力学性能，比如，强度、模量等都已消失，当加工温度达到２００℃时，聚氨酯材料将发生热降解．以上的缺点限制了聚氨酯弹性体的广泛使用．长期以来，如何提高聚氨酯材料的热稳定性已成为研究热点．一般常用方法是在聚氨酯化学结构中引入热稳定性的链段．聚酰亚胺（ＰＩ）作为一类综合性能优越的芳香族耐高温聚合…

Investigation on Thermoplastic Polyurethane-Polyimide Blends

A novel type of polyurethane and polyether-polyimide blends were prepared in two steps. The first step was the preparation of polyether-amic acid by the reaction of an oligmer based on polytetramethylene oxide glycol di-p-aminobenzoate (APTMO) of different molecular weight with benzenetetracarboxylic acid dianhydride (PMDA). The second step was mixing polyether-polyurethane and polyether-polyamic acid solution at room tem- perature in various weight ratios and the blend films were obtained by casting and then heating imidization .In- frared spectroscopy, dynamic mechanical analysis,differential scanning calorimetry,, wide-angle X-ray diffraction and sham-sires testing were used to study this family of blends. DMA and DSC results show that the blends exhibit a well phase-separated morphology and possess a wide range of service temperature, which varies with the PU content. The thermal stability of PU is found to increase obviously by the incorporation of PI. The excellent tensile properties of the blends suggest that they could be potentially ed as heat resistant thermoplastic elas-tomers.