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和聚乙二醇混合聚醚为软段,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,利用TEM、WAXD、DSC对聚合物进行了表征,并测试了其力学性能。结果表明,聚合物具有微相分离的特征,随着聚乙二醇分子量的增大,微相分离程度增加,拉伸强度和延伸率也随着增加。当PEG分子量为4000时,聚合物的综合性能达到最优。
The properties and morphology of segmented polyether thermoplastic polyurethane elastomers consisting of EO／THF copolyether and polyethelene glycol(PEG) as the soft segments and isophorone diisocyanate extended with 1,4-butanediol as the hard segments were studied by means of tensile testing, TEM, WAXD and DSC. The results show that the TPUs have typical microphase separation which increases with PEG molecular weight increasing, as well as the stress and strain. When PEG with a molecular weight of 4000 is used, the integrative properties of TPU are optimum.
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