N-脒基脲二硝酰胺放热分解反应的动力学行为

用DSC和微热量仪研究了N-脒基脲二硝酰胺(GUDN)的放热分解反应动力学行为和比热容, 计算得到程序升温下GUDN主放热分解反应的动力学参数(活化能Ea和指前因子A)、自加速分解温度(TSADT)、绝热条件下达到最大分解反应速率的时间(tTMRad)和至爆时间(tTIad). 结果表明, 在非等温DSC条件下, GUDN的热分解过程可用经验级数自催化动力学方程dα/dt=10^18.49exp(-195500/RT)(1-α)^0.81+10^18.00exp(-177000/RT)α^1.29(1-α)^0.71描述. 热分解转热爆炸的临界温升速率为0.1236 K·h-1. 所得的TSADT、tTMRad和tTIad值分别为473.95 K、2.24 s和3.51 s.

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(GODN)were determined by DSC and mircocalorimeter.Its kinetic parameters of the major exothermic decomposition reaction in a temperature-programmed mode the apparent activadon energy(E)and preexponendal factor(A)],self-accelerating decomposition temperature(TSADT),time to maximum rate(tTMrad),and time-toignition(tTIad)under adiabatic conditions were calculatecL The results showed that under non-isothermal DSC conditions.the thennal decomposition of GUDN could be described by the empiric-order autocatalytic equation:dα/dt=1018.49×exp(-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 TSDT,tTMRad, and tTIad were 473.95 K, 2.24 S,and 3.51 S,respectively.