利用PDSC、TG和DSC -FTIR联用技术和加热裂解原位池红外技术研究了两种燃速催化剂对PDADN -RDX - CMDB推进剂热分解的影响,结果表明,推进剂的热行为有很大改变:分解温度降低、分解热增大、分解放热速率提高,主要组分的标志性官能团提前消失,主要气体产物提前出现,具有负生成热的气体放出量明显增加.初步阐明这些变化与燃烧性能的关系,并用一个经验方程关联了PDSC特征量与燃速.初步探索了催化剂的作用机理,这两种催化剂改变了推进剂中PDADN和RDX组分的分解机理,使C—N键在分子断裂的竞争反应中占优.%The influence of two catalysts on the thermal behavior of PDADN - RDX - CMDB( PRC) propellant was investigated with PDSC, TG, DSC -TG - FTIR coupling and in situ thermolysis FTIR cell techniques. It was shown that the changes of the thermal decompositions of the PRC propellants with the catalysts; decomposition temperature draped down, decomposition heat and release rate of heat increased, the marking groups of main ingredients disappeared in advance, and the gas products appeared in advance and the gaseous products with negative formation heat (△Hf0 ) increased. The relationships of these changed with combustion performances were briefly explained and the characteristics of PDSC were related with burning rates by an empiric formula. The mechanism of catalysis reaction had been discussed. It was considered that C-N bond split predominance in two competing branch reactions of PDADN and RDX in PRC propellants was caused by the catalyst reaction.
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