Kinetics and mechanism of the exothermic first-stage decomposition reaction for 1,5-dimethyl-2,6-bis(2,2,2-trinitroethyl)-4,8-dinitroglycoluril

Under linear temperature increase condition the thermal behavior, mechanism and kinetic parameters of the exothermic first-stage decomposition reaction of the title compound have been studied by means of DSC, TG–DTG and IR. The reaction mechanism was proposed. The kinetic model function in differential form, apparent activation energy and pre-exponential constant of this reaction are (1−α)0.5, 194.7 kJ mol−1 and 1018.45 s−1, respectively. The critical temperature of thermal explosion of the compound is 200.8 °C. The values of ΔS≠, ΔH≠ and ΔG≠ of this reaction are 133.3 J mol−1 K−1, 203.9 kJ mol−1 and 142.0 kJ mol−1, respectively.