Preparation, nonisothermal decomposition kinetics, heat capacity, and safety parameters of TKX-50-based PBX

TKX-50-based PBX (PBX-T) is prepared by solution–water suspension method using dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) as the explosive. The thermal behavior of PBX-T is investigated under a nonisothermal condition by using TG-DTG and DSC method. The kinetic parameters (E_a = 167.98 kJ mol⁻¹ and A = 10^16.05 s⁻¹) for the main thermal decomposition reaction of PBX-T are calculated from the analysis of DSC curves by differential method and integral method, and the nonisothermal kinetic equation of the exothermic process is d α/ d T= (10 ^16.05/ 2 β) 5 (1 - α) [- ln (1 - α) ] ^{3 / 5}exp (- 2.0204 × 10 ⁴/ T) , suggesting that the main exothermic decomposition reaction mechanism of PBX-T is classified as Avrami–Erofeev equation. The specific heat capacity (C_p) of PBX-T is measured using continuous C_p mode of C80 micro-calorimeter. Depending on the thermal decomposition parameters and Chinese Military Standards GJB 772A-97 method, the adiabatic time, self-accelerating decomposition temperature, sensitivities, and 5-second flash point on of PBX-T are obtained.