Self-assembly Hybridization of CL-20 and Hydrazone-based Polymeric Carbon Nitrides for High Performance Explosive

Abstract

A strategy for desensitization of the highly sensitive explosive CL-20 with polymeric carbon nitrides is described. The hybrid energetic material (MHGP-CL-20) was synthesized via a self-assembly approach, where CL-20 molecules are immobilized on the hydrazone-based polymeric carbon nitrides. The good detonation performances (detonation velocity 9608 m·s−1, detonation pressure 42.8 GPa) show that MHGP-CL-20 retains the excellent performance of CL-20 to the greatest extent. More importantly, its sensitivities were effectively reduced with the impact sensitivity (IS) 10 J and the friction sensitivity (FS) 160 N, which is much lower compared with raw ε-CL-20 (IS: 4 J; FS: 94 N). In addition, its specific impulse was improved to 276.6 s, higher than that of ε-CL-20 (272.4 s). By preparing solid composite propellants, the burning rate of the propellant grain PMC20 based on MHGP-CL-20 is higher than PC20 based on ε-CL-20. The addition of hybrid energetic complex could keep the stability of combustion and improve the burning rate of solid propellant. The combination of PCNs material and CL-20 sustains the excellent performance of CL-20 and reduces the sensitivity effectively. The preparation of hybrid energetic material MHGP-CL-20 finds a new balance in the contradictory system of high energy and low sensitivity.