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

Introduction N-Guanylurea dinitramide (GUDN) is a new ener-getic oxidizer with higher energy and lower sensitivity. Its crystal density is 1.755 g·cm-3. The detonation velocity is about 8210 m·s-1. Its specific impulse and pressure exponent are 213.1 s and 0.73, respectively. It has the potential for possible use as an energy ingredient of propellants and explosives from the point of view of the above-mentioned high performance. Its preparation,1 properties2 and hygroscopocity2 have been …

Thermochemical Properties and Non-isothermal Decomposi-tion Reaction Kinetics of N-Guanylurea Dinitramide (GUDN)

The constant‐volume combustion energy, Δ_cU (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_cU (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.