N-脒基脲二硝酰胺放热分解反应的动力学行为

摘要

The kinetic behaviour of the exothermic decomposition reaction and the specific heat capacity of Nrnguanylurea 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,rnand tTIad were 473.95 K, 2.24 S,and 3.51 S,respectively.%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(tTRad)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=1018.49exp(-195500/RT)(1-α)0.81+1018.00exp(-177000/RT)α1.29(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.