Critical temperature(Tb) of thermal explosion for energetic materials is estimated from Semenov's thermal explosion theory and the non-isothermal kinetic equation da/dt=Aoexp(bT)[1+(T-T0)b][(a) deduced via reasonable hypotheses, where To is the initial point of the deviation from the baseline of DSC curve. The final formula is (Tb-Te0){ 1+1/[1+( Tb-T00)b]}=1. We can easily obtain the initial temperature(T0/) and onset temperature(Tci) from the non-isothermal DSC curves, the values of Too and Tc0 from the equation TOi or ei=T00 or c0+α1βi+a2βi^2+…+aL-2L-2βiL-2, i=1,2,…L, the value of b from the equation: In[β/(Tei-T0i)]=ln[A0/G(a)]+bTei, so as to calculate the value of Tb. The result obtained with this method coincides completely with the value of Tb obtained by Hu-Yang-Liang-Wu method.
The kinetic parameters of the exothermic decomposition reaction of s-Tripicryaminotrinitrobenzene under linear temperature rise condition are studied by means of DSC. The results show that the empirical kinetic model function in differential form, apparent activation energy and pre-exponential constant of the reaction are 225.4 kJ·mol-1 and 1 019.53 s-1, respectively. The critical temperature of thermal explosion of the compound is 267.36 ℃.