端羟基聚丁二烯／聚醚型聚氨酯弹性体的合成及性能

Synthesis and Properties of HTPB/PTHF Polyurethane Elastomers

研究端羟基聚丁二烯／聚醚型聚氨酯弹性体的配方。探讨游离—ＮＣＯ含量、以Ｎ，Ｎ－二（２－羟两基）苯胺（ＩｓｏｎｏｌＣ－１００）为扩链剂时，扩链系数以及端羟基聚丁二烯／聚四氢呋喃并用比等对弹性体力学性能的影响。试验结果表明，游离—ＮＣＯ含量为８．５％，扩链系数为０．８９时，弹性体的综合性能优良；端羟基聚了二烯／聚四氢呋喃并用比减小时，能改善弹性体的拉伸强度和撕裂强度。电子显微镜观察证明弹性体中呈现明显的软段相区和硬段相区。

The formula of hydroxy-terminated polybutadiene (HTPB )/polytetrahydrofuran (PTHF)polyurethane elastomers was studied. The influence of the free -NCO content,the chain extend coefficient with N,N-di(2-hydroxy propyl) aniline chain extender,and the ratio of HTPB/PTHF on the physical properties of elastomers was investigated. The test results showed that the good balanced properties of elastomers were obtained when the free -NCO content was 8. 5% and the chain extend coefficient was 0. 89; the improved tensile strength and tear strength of elastomers were obtained as the ratio of HTPB/PTHF decreased. It was showed by electron microscope that the remarkable soft blocks and hard blocks existed in the elastomers.