Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (03): 453-458.doi: 10.3866/PKU.WHXB20080318

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Kinetic Behaviour of the Exothermic Decomposition Reaction of N-Guanylurea Dinitramide

GAO Hong-Xu; ZHANG Hai; ZHAO Feng-Qi; HU Rong-Zu; MA Hai-Xia; XU Kang-Zhen; YI Jian-Hua; XU Si-Yu; GAO Yin   

  1. Xi’an Modern Chemistry Research Institute, Xi’an 710065, P. R. China; 2Department of Mathematics, Northwest University, Xi’an 710069, P. R. China; 3College of Chemical Engineering, Northwest University, Xi’an 710069, P. R. China
  • Received:2007-08-14 Revised:2007-12-11 Published:2008-03-10
  • Contact: ZHAO Feng-Qi

Abstract: 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 (Ea) and pre-exponential factor (A)], self-accelerating decomposition temperature (TSADT), time to maximum rate (tTMrad), and time-to-ignition (tTIad) under adiabatic conditions were calculated. The results showed that under non-isothermal DSCconditions, the thermal decomposition of GUDN could be described by the empiric-order autocatalytic equation: dα/dt=1018.49exp(-195500/RT)(1-α)0.81+1018.00exp (-177000/RT)α1.29 (1-α)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 TSADT, tTMRad, and tTIad were 473.95 K, 2.24 s, and 3.51 s, respectively.

Key words: GUDN, Autocatalytic decomposition, Kinetic parameters, Critical rate of temperature rise, Thermal explosion, Non-isothermal DSC