Abstract: The effect of some commonly used propellant ingredients on the thermooxidative degradation of polyurethane binder was studied by using FT IR and NMR to detect the structural changes of the binder during the degradation process which was carried out at 90°C in air.Energetic fillers and additives,including ammonium perchlorate(AP),HMX,aluminium power,black carbon,nitrocellulose and a coupling agent,can′t modify the degradation mechanism of the polyurethane binder but show some different stabilizing effect.The sample containing AP kept its solid state in the whole procedure while other samples were all gradually changed into liquid.The thermooxidative degradation of NEPE propellant started with the evaporation and decomposition of nitrate esters and centralite,followed by the degradation of polyurethane binder,resulting in the loss of mechanical properties of the propellant.

Key words: Solid propellant;polyether urethane +;Thermooxidation +;Filler;Auxiliary agent

摘要： 采用ＦＴ－ＩＲ和多种ＮＭＲ技术研究了推进剂中常用的几种填料和助剂对聚醚聚氨酯粘合剂热氧降解的影响。高氯酸铵、奥克托金、铝粉、硝化纤维素、键合剂、碳黑等均不改变聚氨酯粘合剂的降解机理，但表现出不同程序的稳定作用。过氯酸铵的吸附作用使样品始终保持固体形态，而含其它组分的样品在降解过程中逐渐变为液态。在ＮＥＰＥ推进剂的热氧降解过程中，硝酸酯和中定剂逐渐挥发分解，粘合剂发生降解，导致推进剂强度降低。

关键词: 固体推进剂;聚醚聚氨酯;热氧降解;填料;助剂