利用选择性溶解法研究NEPE推进剂的微观结构

为探索NEPE复合固体推进剂的微观结构特征，了解各组分在推进剂中的微观形态，对NEPE复合固体推进剂在水和三氯甲烷中的溶解过程进行了现象观测，得到了质量损失及离子浓度变化数据。用扫描电子显微镜对溶解剩余物进行了形貌观测。结果表明，NEPE推进剂中的黏合剂把固体颗粒粘结在一起。从微观结构上看NEPE推进剂比较致密，水和三氯甲烷都只能以渗透方式缓慢进入。推进剂中黏合剂的交联程度不高，未交联的黏合剂很容易被溶解；黏合剂受力伸长时包覆在其中的固体颗粒易脱离出来。

Study on Microstructure of NEPE Propellants Using Difference of Solubility

To probe the microstructure of NEPE composite propellants and get the morphology of each constitute in propellants, the solvation process of NEPE propellants in water and trichloromethane was studied. The data of mass loss and the results of ion concentration changing were obtained from the test. Scanning Electron Microscope was used to observe the dissolve residual of NEPE propellants. The results show that most solid particles in origin NEPE propellants are wrapped by polymer binder. The microstructure of NEPE propellants is compact, so H20 and CHCIs molecular can only seep in it. The crosslinkage rate of propellants binder is low, so un-crosslinked binder on surface part can enter solvent easily. The bonding between solid particles and polymer binder is not firm since most of the solid particles would leave binder when it was stretched.