Effects of Polymers on Phase Transition of ε-CL-20 and CL-20-Based PBXs

TJ55; The powder X-ray diffraction technique is applied to investigate phase transitions of ε-CL-20 coated with additives (polymers and wax) and of ε-CL-20 heated in petroleum ester at different temperature points. First, CL-20-based plastic-bonded explosives (PBXs) were prepared by mechan-ical kneading. Characteristics of different polymer binders were measured and the relationship be-tween polymer properties and sensitivity of CL-20-based PBXs was analyzed. The results indicated that ε-CL-20 coated with or without additives both showed high stability in the crystal phases at dif-ferent temperature in petroleum ether. Compared with thermal conductivity, friction efficient and specific heat capacity, hardness of polymers has the most dominant effect on the sensitivity of CL-20-based PBXs. Butadiene rubber (BR) showed the best desensitizing effect among the chosen binders. Combination of EPDM and other several polymers (C-EPDM) as the polymer binder has higher press density and a lower expansion rate.