复合固体推进剂长贮中HTPB胶微结构损伤研究

Microstructure damage of HTPB glue in the long-time storage of composite solid propellants

为研究HTPB复合固体推进剂老化过程中微结构损伤机理,设计了HTPB/TDI、AP+HTPB/TDI、RDX+HTPB/TDI、Al+HTPB/TDI及HTPB复合固体推进剂5个体系,表征在75℃、92 d的热加速老化过程中各复合体系及线性HTPB微结构变化规律。结果显示,在密闭热加速老化过程中,线性HTPB分子间不饱和的CC键相互交联,生成了高分子网络结构,是线性HTPB及各复合体系在老化过程中数均分子量及交联密度增大的原因之一;AP、RDX、Al粉等组分间相互作用加速了HTPB复合固体推进剂的热老化过程,且电镜未观察到组分与粘合剂产生"脱湿"现象。

To investigate the microstructure damage mechanism of HTPB composite solid propellants in the ageing process,five systems,i. e. HTPB / TDI,AP＋HTPB / TDI,RDX ＋HTPB / TDI,Al ＋HTPB,and HTPB composite solid propellant were designed and their microstructures were characterized in the thermal accelerated ageing process of 92 days at 75 ℃. The results show that the crosslinking of unsaturated CC bonds among the linear HTPB molecules leads to the formation of polymer network structure,which is one of the reasons for the increase of number-average molecular weight and crosslinking density. The interactions among propellant components such as AP,RDX,and Al powder accelerate the thermal ageing process of HTPB composite solid propellants,and dehumidification between propellant components and binding agent is not observed by scanning electron microscope.