Preparation and characterization of core–shell structured FOX-7/F2602 PBX with improved thermal stability and reduced sensitivity

To improve thermal stability and security of energetic materials, the core–shell structured FOX-7 (1,1-diamino-2,2-dinitroethylene)/F2602 (fluoroelastomer) PBX (polymer bonded explosive) was prepared from recrystallized by a spray drying strategy. The morphology crystal form were retained, mean particle size FOX-7/F2602 apparently reduced 39.72 µm raw to 1.50 µm. SEM, TEM, XPS analysis showed that F2602 deposited on surface composite. formation mechanism composite proposed. Compared with grains, had higher apparent Ea Tb, which signifies improved safety. impact sensitivity test critical height value (H50) remarkable enhancement, indicating better mechanical security. This work provides simple effective method prepare enhanced safety performance.