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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165.3 kJ.mol-1,指前因子ln(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1.81×10-5s-1。CL-20在100℃时的放气量为0.502 mL.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=13 996.1/T-27.013,外推得到室温25℃时CL-20的有效贮存寿命为14.4 a。
The dynamic vacuum stability test (DVST) method was used to study the thermal decomposition of CL-20 under airtight conditions. The results show that the apparent activation energy Ea is 165.3 kJ · mol-1 and the pre-exponential factor ln (A / s-1) is the Avrami-Erofeev equation for the non-isothermal CL- ) Is 40.20. The mechanism of the thermal decomposition reaction in isothermal phase changed with the different experimental temperature. The reaction rate constant increased exponentially with the increase of temperature from1.01 × 10-6s-1 at90 ℃ to1.81 at140 ℃ × 10-5s-1. The deflated volume of CL-20 at 100 ° C was 0.502 mL.g-1, indicating that CL-20 has good thermal stability. CL-20 was used to decompose 0.1% of the time in the range of 110-140 ℃. The fitting Semenov equation was lntT = 13996.1 / T-27.013, and the effective storage life of CL-20 was 14.4 a.