CL-20热分解的动态真空安定性试验方法

摘要

采用动态真空安定性试验(DVST)法,在真空密闭条件下对CL-20的热分解过程进行了研究.结果表明,在90～140℃,CL-20非等温阶段的热分解反应机理函数为Avrami-Erofeev方程,表观活化能Ea为165.3kJ·mol-1,指前因子In(A/s-1)为40.20.等温阶段热分解反应的机理函数随试验温度的不同而发生变化,反应速率常数随温度的升高呈指数形式增加,由90℃时的1.01×10-6s-1,升至140℃时的1.81×10-5 s-1.CL-20在100℃时的放气量为0.502mL·g-1,表明CL-20具有较好的热安定性.利用CL-20在110～140℃范围内分解0.1%所需时间的数据,拟合Semenov方程为lntT＝(13996.1/T)-27.013,外推得到室温25℃时CL-20的有效贮存寿命为14.4a.%The thermal decomposition of CL-20 was investigated by dynamic vacuum stability test (DVST).The results show that the mechanism function of non-isothermal decomposition of CL-20 is Avrami-Erofeev equation with n =4.The apparent activation energy Ea is 165.3 kJ · mol-1 , and the pre-exponential factor In (A/s-1 ) is 40.20.Isothermal decomposition mechanism function changes with temperature, the reaction rate constant increases exponentially with temperature from 1.01 × 10-6 s-1 at 90℃ to 1.81 × 10-5 s-1 at 140 ℃.The amount of decomposition gases of CL-20 tested at 100℃ is 0.502 mL · g-1, showing that the thermal stability of CL-20 is better.By fitting the Semenov equation, the effective storage life of CL-20 at 25℃ is 14.4 a.