Effective desensitization of composite materials HMX@PDA by insensitive DAAF: To improve safety performance

The sensitivity of energetic materials to external stimuli (mechanical, flame, etc.) limits their practical application. In order to improve the safety of HMX@PDA composite materials. In this study, HMX/DAAF@PDA composite microspheres with different mass ratios were prepared using a microfluidic self-assembly strategy, and the morphology, size, crystal structure, thermal behavior, flowability and mechanical sensitivity of the sample microspheres were analyzed. The results showed that the addition of DAAF did not change the crystal structure of the composites, and the HMX/DAAF@PDA composite microspheres showed high consistency and repeatability, concentrated particle size distribution, sphericity greater than 0.9 and good flowability. Meanwhile, the impact sensitivity of the sample was increased from 25 J to 50 J (S-3) and the friction sensitivity was increased from 160 N to 216 N. In addition, the ignition experiment and EXPLO5 calculation results show that the addition of insensitive DAAF can reduce the combustion of composite materials, thereby improving the application safety of the composites. This study provides a way for the design and preparation of high-energy insensitive composite explosives.