HTPB/Al/AP/RDX复合推进剂组元之间相互作用研究

In order to study the interaction between composite propellant components, four hybrid systems of progressive components (HTPB binder system, HTPB/Al, HTPB/Al/AP and HTPB/Al/AP/RDX) were investigated. The interactions between components were studied through DSC, TG-DTG methods and kinetic calculations. The results showed that the DTG peak temperature and reaction rate constant (k) could characterize the interactions between the components. Corresponding DSC and DTG processes were divided into three stages. Except Al, there were interactions between different components and the measured value of mass loss at each stage agreed well with the sum of the calculated contents of the components with no obvious cross-stage decomposition observed. The decomposition temperature range of AP and HTPB was close or partially overlap, and strong redox occurs in the hybrid system of HTPB/Al/AP and HTPB/Al/AP. The rate constant of RDX at 200℃ and 220℃ in the quaternary system were 1.53s^-1and 6.81s^-1, which were greater than that of elemental RDX at the same temperature, incdicating that AP could accelerate the decomposition of RDX while the role of RDX in the decomposition of AP or (AP+HTPB) proved to be complicated. Isokinetic point (308.0℃) existed in the decomposition process of AP and HTPB for HTPB/AI/AP and HTPB/AI/AP/RDX systems. Due to the present of RDX, the decomposition rate constant of (AP+HTPB) decreased when the heating temperature is lower than isokinetic point but increased when the heating temperature was higher than isokinetic point. The reason for this phenomenon was further explained based on the decomposition mechanism of RDX.