Thermal decomposition behavior and thermal stability of DABT·2DMSO

The thermal decomposition behavior and thermal stability of 3,3′-diamino-5,5′-bis(1H-1,2,4-triazole) with 2DMSO (DABT·2DMSO) were investigated by thermo gravimetry–derivative thermo gravimetry–differential scanning calorimetry (TG–DTG–DSC), differential thermal analysis (DTA) and accelerating rate calorimeter (ARC). The result of TG–DTG–DSC at a heating rate of 10 °C min⁻¹ indicated that an endothermic decomposition and an exothermic decomposition occurred at 388.23 and 468.23 °C, respectively. The apparent activation energy (E_a) and pre-exponential factor (A) of the exothermic decomposition, and the free energy of activation, activation enthalpy and activation entropy at initial decomposition temperature (T_p0) were calculated from the DTA curves recorded at heating rates of 1, 2, 4, 8 °C min⁻¹. The critical temperature of thermal explosion (T_bp0) obtained by the Ozawa’s and Kissinger’s methods were calculated as 470.46 and 470.73 °C, respectively. The result of ARC indicated that the self-heating decomposition started at 443.61 °C and ended at 480.91 °C, within the time span of 1397.50 min. The self-heating decomposition parameters, including the onset temperature, final temperature, temperature at max rate, max temperature rate, adiabatic temperature rise and time to maximum rate were obtained, and these parameters were corrected by thermal inertia factor. The E_a and A under adiabatic condition were also calculated. In addition, the self-accelerating decomposition temperature (T_{SADT, 50kg}) was calculated as 429.54 °C.