硬段含量对嵌段聚脲结构与性能的影响

以端氨基聚醚、异佛尔酮二异氰酸酯(IPD I)、二乙基甲苯二胺(DETDA)为主要原料,制备了一组硬段含量不同的IPD I基聚脲。通过FT-IR、DSC、SEM以及拉伸等测试手段,研究了硬段含量对聚脲羰基氢键化程度、微观结构及其力学性能的影响。结果表明:随着硬段含量的增加,脲羰基氢键化程度增加;软段相的微相分离率降低,硬段有序程度增大。硬段含量为35%时材料的力学性能较佳。

Influence of the Hard-Segment Content on the Structure and Properties of Segmented Polyurea

Polyurea was prepared from amine terminated polyether(Jeffamine D-2000),isophorone(diisocyanate)(IPDI) and diethyltoluene diamine(DETDA) as primary materials.The influences of hard-(segment) content on the degree of the hydrogen bonding of urea groups,micro-structure and properties of polyurea films were studied by means of FT-IR,DSC,SEM and tensile tester.The results show that with the increase of hard-segment content,the degree of hydrogen bonding of urea groups and the degree of(order) for hard-segment also increase,while the value of SR_s,represent of microphase separation for(soft-segment) decreases.Besides,these materials have better mechanical properties at 35% hard-segment(content).