Bioinspired Strategy for HMX@hBNNS Dual Shell Energetic Composites with Enhanced Desensitization and Improved Thermal Property

Abstract

Abstract To explore the new energetic candidate with high energy and low sensitivity, hexagonal boron nitride nanosheets (hBNNS) are first introduced into the field of energetic materials with a bioinspired strategy, and a novel core@dual shell energetic composite is constructed with 1,3,5,7‐tetranitro‐1,3,5,7‐tetrazocane (HMX) as core, adhesive polydopamine (PDA) as inner shell and hBNNS as exterior shell. The composites are analyzed by several methods to in‐depth investigate the core@dual shell structure and its influence on the performance of energetic crystal. These results indicate adhesive PDA is a crucial bridge between HMX and low contents of hBNNS in core@dual shell structure, and the adhesive PDA is a crucial bridge between the HMX and hBNNS. The coating does not affect the chemical structure and polymorph of HMX. The PDA can stabilize the polymorph of HMX, and hBNNS can increase the thermal stability of HMX. The nonisothermal analysis further shows HMX@PDA@hBNNS composites exhibit better thermal stability than that of HMX and HMX@PDA by increasing the apparent activation energy. Furthermore, the coated PDA and hBNNS can reduce the impact and friction sensitivities significantly, precisely because of the buffering effect of “soft” hBNNS and isolation effect of dual shell.