Thermochemical Properties and Non‐isothermal Decomposition Reaction Kinetics of N‐ Guanylurea Dinitramide (GUDN)

The constant‐volume combustion energy, Δ c U (GUDN, s, 298.15 K), enthalpy of solution in acetic ether, Δ H θ m and kinetic behavior of the exothermic decomposition reaction of the title compound (GUDN) are determined by a precise rotating bomb calorimeter, a Calvet microcalorimeter and DSC, respectively. Its standard enthalpy of combustion, Δ , H θ m : (GUDN, s, 298.15 K), standard enthalpy of formation, Δ, H θ m (GUDN, s, 298.15 K) and kinetic parameters of the exothermic main decomposition reaction in a temperature‐programmed mode [the apparent activation energy ( E a ) and pre‐exponential factor ( A)] are calculated. The values of Δ c U (GUDN, s, 298.15 K), Δ H θ m (GUDN, s, 298.15 K), Δ, H θ m (GUDN, s, 298.15 K) and Δ sol H θ m of GUDN are (‐7068.64×2.37) I‐g (‐1467.66×0.50) kJ · mol −1 , (‐319.76×0.58) kJ · mol −1 and (165.737×0.013) kJ·mol −1 , respectively. The kinetic model function in integral form and the value of E a and A of the exothermic main decomposition reaction of GUDN are 220.20 kl · mol −1 and 10 21.18 s −1 , respectively. The critical temperature of thermal explosion of GUDN is 217.6 °C.