摘要：

Polytetrahydrofuran (PTHF) is a candidate binder ingredient to improve the burning performance of composite propellant because PTHF has one oxygen atom in the repeating unit The molecular structure of PTHF is similar to that of HTPB. Therefore, PTHF would be easily blended with HTPB and a homogenous blend would be prepared. PTHF is commercially produced in several different molecular weights. It would be expected that the mechanical properties and burning characteristics of composite propellants would be controlled by molecular weight of PTHF and PTHF/HTPB mass ratio when PTHF/HTPB blend would be used as a binder. The curing behavior, the tensile property, and the thermal decomposition characteristics of PTHF/HTPB blends were investigated in this study. The molecular weights of PTHFs were 650, 1400, and 2900. The curing behavior and tensile property depended on molecular weight of PTHF and PTHF/HTPB mass ratio. The temperature range of the main thermal decomposition of the PTHF/HTPB blends was lower compared with that of HTPB alone.

展开