笼形结构硅倍半氧烷提升聚醚复合推进剂力学和燃烧性能研究

It is desirable to find multi-functional auxiliaries which can simultaneously improve mechanical properties，catalyze combustion and promote aluminum combustion of composite solid propellants. Caged oligomeric silsesquioxanes（POSS）is a kind of organic-inorganic hybrid. In this paper，four kinds of caged oligomeric silsesquioxanes with the phenyl，nitrophenyl，dinitrophenyl and aminophenyl as organic groups were applied to hydroxyl-terminated ethylene oxide-tetrahydrofuran copolyether（PET）/ammonium perchlorate/aluminum powder composite propellants with 1wt% content. It is obtained that the four kinds of POSS could raise the tensile strength and elongation of the propellants，and the octa（aminophenyl）silsesquioxane（OAPS）is the best；could increase the burning rates of the propellants under 3~18MPa，and significantly decrease the burning rate pressure index under 10.5~18MPa；could inhibit the agglomeration of aluminum particles during combustion，and significantly reduce the size of the condensed-phase combustion products，and the octa（dinitrophenyl）silsesquioxane（ODNPS）is the best.