摘要
以环氧乙烷—四氢呋喃无规共聚醚(PET)、异佛尔酮二异氰酸酯(IPDI)和1,4-丁二醇(BD)为原料,采用预聚法(二步法)合成热塑性聚氨酯弹性体(TPU)粘合剂。确定预聚温度为700C,反应温度为1000C,以及预聚反应时间为1.5～2.0小时。通过调整硬段、软段含量对TPU的性质进行优化,获得用于含能材料的粘合剂。通过凝胶渗透色谱(GPC)分析和力学性能测试对所合成的TPU进行表征。测试结果表明,随着硬段含量的增加,TPU的拉伸强度不断增大,断裂伸长率则降低。当硬段含量在45%～55%时TPU的综合性能达到最佳。
A thermoplastic polyurethane elastomer based on ethylene oxide/terrahydrofunan random copolyether as soft segments, isophorone diisocyanate and 1,4 -butanediol as hard segments was synthesized for the purpose of using as propellant binder. A series of thermo-plastic polyurethanes elastomer with different hard segment contents are synthesized by melt-repolymerization method. To determine prepolym temperature, reaction temperature and prepolym time.They are 70℃,100℃ and 1.5～2.0h. To acquire TPU having excelle...
基金
四川省科技厅基金资助(编号:04JY029-060-1)
