一种含能热塑性聚氨酯弹性体的性能

Properties of New Energetic Thermoplastic Polyurethane Elastomer

采用熔融二步法合成了以聚叠氮缩水甘油醚(GAP)为软段、以2,2-二叠氮甲基-1,3-丙二醇和二环己基甲烷二异氰酸酯(HMDI)为硬段的含能热塑性聚氨酯弹性体(FTPUE),通过红外光谱(FT-IR),差示扫描量热(DSC),动态力学性能测试(DMA)及力学性能测试对材料进行了结构和性能的表征。结果表明,所合成的不同硬段含量的ETPUE具有含-N_3基团的ETPUE的特征;该ETPUE没有明显的结晶,呈现明显的两相分离的结构,软段具有较低的T_g;随着硬段含量增加,ETPUE硬段的聚集能力增强,其拉伸强度增加而断裂伸长率降低,硬段含量为50%～55%时具有较佳的综合性能。

A series of energetic thermoplastic polyurethane elastomer （ETPUE） were synthesized through bulk polymerization, which contained glycidyl azide polymer （GAP） as the soft segment, 2,2-bis（azidomethyl） -propane- 1,3-diol and 4,4＇-dicyclohexyl-methane diisocyanate （HMDI） as the hard segment. The experimental techniques utilized were Fourier transform infrared spectrum （FT-IR）, differential scanning calorimetry （DSC）, dynamic mechanical analysis（DMA） and tensile testing to study the properties of the ETPUE. The results show that the ETPUE have the character of the GAP based ETPUE. All ETPUEs have two phase separation characteristics and are amorphous at all-levels of hard-segment content. The tensile stress of the ETPUE increases with the hard-segment content increasing, while the strain decreases. It has a favorable property while the hard-segment content is controlled at 50 % - 55 %.