Preparation of HMX@NPBAs microparticles by coating process with improved mechanical properties, thermal stability and safety performance

Abstract

Polymer-bonded explosives (PBXs) played a critical role in lethality and destruction as a vital military explosive in the world. Unfortunately, the current PBXs exhibit poor properties in safety performance and reliability for the weak interfacial surface, which cannot meet requirements of the high security and high reliability of weapons and ammunition in the harsh environment of modern battlefields. Herein, the neutral polymeric bonding agents (NPBAs) were successfully coated in the surface of 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX) and proved to enhance the mechanical performance and reliability of PBXs. The SEM images indicated a slight aggregation of NPBAs coated in the HMX surface, the XRD spectra of HMX@NPBAs had an analogous spectrum of HMX, and the XPS spectrum confirmed that the NPBAs played a role on the surface of HMX by coating. Furthermore, the HMX coated with NPBAs had more excellent safety performance, thermal stability and mechanical properties. The strategy is helpful to strengthen the interaction between HMX and binder matrix, which provides a brilliant idea in modifying for the weak interfacial surface of energetic crystals.