The GO composite coatings for enhancing interfacial interaction performance and desensitization of CL-20

Abstract

Although CL-20 is one of the most widely used high-explosives, the issue of its high sensibility and interfacial interaction with coating material in composite explosives have not yet been well understood. Herein, the electrostatic self-assembly capability of a graphene oxide (GO) aqueous solution was utilized to desensitize CL-20 and enhance its interfacial interaction by preparing a CL-20@GO@desensitizer composite, which was prepared by the “one-pot” water suspension method. It was found that the CL-20@GO composite exhibited a compact GO cladding layer and demonstrated exceptional safety characteristics. On this basis, the structure and performance of three CL-20@GO@densitizer composites were characterized by SEM, XPS, ZETA, DSC, XRD, and mechanical sensitivity. The morphology of composites showed that GO@microcrystalline wax (MW) was evenly coated on the surface of CL-20 under the influence of ionic charge and -OH bonding. The surface analysis results indicated that three types of GO@desensitizer films possessed exceptional coating effectiveness. The thermal analyses results suggested that the CL-20@GO@ethylene propylene diene monomer (EPDM) endowed Ea of composite up to 351.43 kJ/mol, while, the Ea of CL-20@GO, CL-20@GO@MW and CL-20@GO@MW + EPDM were only 184.36 kJ/mol, 186.21 kJ/mol and 258.79 kJ/mol, respectively. Besides, the XRD results confirmed that the three films had not caused a transformation of the CL-20 crystal phase, which afforded process safety support for the further application of this composite particle. Due to the high thermal conductivity of desensitizer-film, the composite showed a advantage in mechanical sensitivity, which can reach to a level of 252 N and 10 J. These findings can provide a reference for enhancing surface performance and desensitization of CL-20.