高软段PBT基含能热塑性弹性体的热分解性能

Thermal Decomposition Properties of PBT-based Energetic Thermoplastic Polyurethane Elastomers with High Content of Soft Segment

采用预聚体法,通过3,3-二叠氮甲基环氧丁烷-四氢呋喃共聚醚(PBT)与4,4′-二环已基甲烷基二异氰酸酯(HMDI)合成了PBT基含能热塑性聚氨酯弹性体,用DSC对其玻璃化转变进行了表征。用TG、TG-FTIR-MS研究了ETPUE的热分解行为。结果表明,随着硬段含量的增加,含能热塑性聚氨酯弹性体软段和硬段的玻璃化转变温度Tgs和Tgh都向高温方向移动,其热分解分为4个阶段,各阶段的分解活化能不同。第一阶段对应-N3键的断裂,然后诱发主链分解。

The 3,3-bis （azidomethyl） oxetane/tetrahydrofuran （BAMO-THF） copolyether （PBT） bonded energetic thermoplastic polyurethane elastomers （ETPUE） were synthesized through prepolymer method using PBT and 4,4＇-diisocyanato-methylene dicyclohexane as raw material.Its glass transition temperature （Tg） was obtained by DSC,and the thermal decomposition behaviors were studied by TG and TG-FTIR-MS.The results show that with an increase in the content of hard segment,the Tgs and Tgh of soft segment and hard segment of ETPUE shift temperature upwards.The thermal decomposition process can be divided into four stages.The activation energy of thermal decomposition reaction for each stage is different.The first stage corresponds to the scission of the N3 bonds.And then the main chain decomposition is induced.