DSC-FTIR联用研究HTPB/AP和HTPB/AP/Al体系的热分解

Thermal Decomposition of HTPB/AP and HTPB/AP/Al Studied by DSC-FTIR

采用高压差示扫描量热(PDSC)、热重(TG-DTG)以及热红联用(DSC-FTIR)技术研究了HTPB/AP复合体系热分解及压力和铝粉对该体系的影响。结果表明,端羟基聚丁二烯(HTPB)包覆去活作用推迟了AP的热分解过程,但AP加速了HTPB的分解。增大压力和加入铝粉均能加速HTPB/AP复合体系的热分解过程,燃速也因此而提高。同时增大压力也使HTPB分解放热产生多峰现象,而铝粉会抑制该现象。此外,AP还使HTPB发生“后固化”过程,随着压力的增大,该过程的固化热也增大。

The thermal decomposition of HTPB/AP composite propellants and the influence of pressure and Al powder on the thermal decomposition were investigated by PDSC, TG-DTG and simultaneous DSC-FTIR. The results show that the thermal decomposition of AP component in HTPB/AP is delayed due to the coating deactivation of HTPB on AP. The thermal decomposition of HT PB component is accelerated with AP. The thermal decomposition of HTPB/AP system can be accelerated by both the pressure and Al, and the burning rate is increased as well. The pressure causes a phenomenon of multiple peaks which appear on DSC curves of the thermal decomposition for HTPB component, but Al can restrain the phenomenon. Furthermore, the ＂after-solidify＂ process of HTPB result from AP component and the pressure strengthens this process.