GAP型含能热塑性聚氨酯弹性体热分解反应动力学研究

Study on thermal decomposition kinetics of GAP based energetic thermoplastic polyurethane elastomer

采用DSC、TG考察了可用于固体推进剂的GAP型热塑性聚氨酯弹性体(ETPUE)的热分解行为,并分别采用Kissinger方法和Ozawa方法计算了热分解反应的活化能Ea和指前因子lnA等动力学常数。结果表明,GAP型ETPUE的热分解分3个阶段:叠氮基团分解、硬段分解、软段主链分解。给出了放热阶段的热分解机理函数,并研究了硬段含量对热分解性能的影响。

The thermal decomposition behaviors of GAP based energetic thermoplastic polyurethane used in solid propellant were studied on the basis of TG and DSC analysis,and the activation energy Ea and the pre-exponential factor lnA were calculated by using Kissinger and Ozawa method.The results of TG indicate that the thermal decomposition process of ETPUE comprises three stages： azide groups,hard segments,and soft segments decomposition,respectively.The decomposition mechanism function of the first stage,as well as the effects of hard segment content on the decomposition behaviors of ETPUE were investigated in detail.