热塑性聚氨酯弹性体中的氢键作用动态力学分析

摘要

A relatively high degree of physical crosslink was inferred from the superior mechanical properties of thermoplastic polyurethane elastomers(TPU). For the most part, this has been assumed due to hydrogen bonding. In this paper hydrogen bonding effects in some thermoplastic polyurethane elastomers, consisting of poly(tetramethylene oxide) of Mn=2 000, 4,4-diphenyl methane diisocyanate and extenders: N-methyl diethanol amine,1,4-butandiol and 1,2-ethylene diamine, have been studied by using dynamic mechanical analysis. The activation energies of hydrogen bonding dissociation and the physical crosslink densities have been evaluated from the elastic modulus-temperature relation of the TPU samples.%采用动态力学分析方法研究了一系列由聚四氢呋喃（Mn=2 000）、 4,4-二苯基甲烷二异氰酸酯以及N-甲基二乙醇胺、 1,4-丁二醇和1,2-丙二胺三种不同的扩链剂合成的TPU中的氢键作用. 发现这种氢键作用符合Arrhenius型的温度依赖性. 从弹性模量-温度关系曲线上估算出氢键解离活化能和物理交联密度.