IPDI基热塑性聚醚聚氨酯弹性体的形态结构与性能

Morphology and Properties of Thermoplastic Polyether Polyurethane Based on IPDI

采用熔融预聚二步法合成了以环氧乙烷 -四氢呋喃无规共聚醚为软段 ,异佛尔酮二异氰酸酯和 1,4 -丁二醇为硬段的热塑性聚氨酯弹性体 ( TPU) ,利用 DSC,DMA,TEM,WAXD对聚合物的形态结构进行了表证 ,并测试了力学性能 .结果表明 ,聚合物具有典型的微相分离特征 ,随着硬段含量的增加 ,微相分离程度增加 ,拉伸强度也随着增加 ,而延伸率却有降低的趋势 .WAXD分析表明 ,所有 TPU均不存在明显的结晶形态 .当硬段含量为4 5%～ 50 %时 。

A series of novel segmented thermoplastic polyether polyurethane elastomers based on tetrahydrofuran ethylene oxide copolyether [P(E Co T)] as the soft segments and isophorone diisocyanate (IPDI) extended with 1,4 butanediol (BDO) as the hard segments were synthesized to study the relationships between morphology and properties. The experimental techniques utilized were tensile testing, DSC, DMA, TEM and WAXD. The results show that the TPUs have typical microphase separation, it as well as the stress increase with hard segment concentration increasing, while the strain decreases. WAXD results indicate that all elastomers are completely amorphous at all levels of hard segment concentration. When the hard segment concentration is controlled in 45%～50%, the integrative properties of TPU are optimum.