Kinetic behaviour of the exothermic decomposition reaction of N-guanylurea dinitramide

The kinetic behaviour of the exothermic decomposition reaction and the specific heat capacity of N-guanylurea dinitramide (GUDN) were determined by DSC and mircocalorimeter. Its kinetic parameters of the major exothermic decomposition reaction in a temperature-programmed mode [the apparent activation energy (E-a) and pre-exponential factor (A)], self-accelerating decomposition temperature (T-SADT), time to maximum rate (t(TMrad)), and time-to-ignition (t(TIad)) under adiabatic conditions were calculated. The results showed that under non-isothermal DSC conditions, the thermal decomposition of GUDN could be described by the empiric-order autocatalytic equation: d alpha/dt=10(18.49)x exp(-195500/RT)(1-alpha)(0.81)+10(18.00)exp (-177000/RT)alpha(1.29) (1-alpha)(0.71), and the value of the critical rate of temperature rise in GUDN was 0.1236 K . h(-1) when the decomposition reaction converted into thermal explosion. The values of T-SADT t(TMRad), and t(TIad) were 473.95 K, 2.24 s, and 3.51 s, respectively.