LLM-105基PBX炸药的热分解反应动力学

Kinetics of Thermal Decomposition Reaction of LLM-105 Based PBX Explosives

通过布氏压力计法获得了普通的和纳米化的LLM-105基PBX炸药在不同温度条件下热分解放气量随时间的变化曲线。基于Arrhenius公式计算了两种PBX炸药分解深度为0.1%时的表观活化能。采用TG-DSC研究了两种LLM-105基PBX炸药的非等温热分解反应动力学。结果表明,由Arrhenius公式得到的普通和纳米化的LLM-105基PBX炸药在分解深度为0.1%时的表观活化能分别为74.67和138.09kJ/mol。利用Kissinger法计算获得两种LLM-105基PBX炸药在最大分解速率(分解深度约50%)下的表观活化能分别为389.26和215.73kJ/mol,与Ozawa法计算结果相吻合。升温速率趋于零时的特征分解峰值温度分别为606.94和586.48K,热爆炸临界温度分别为615.0和600.4K。相对于普通LLM-105基PBX炸药,纳米化LLM-105基PBX炸药热分解具有更高的反应活性,热感度也有所提高。

The curves of change in volume of gas evolved with time during the thermal decomposition of normal and nanocrystallization LLM-105 based plastic bonded explosive(PBX)at different temperatures were measured by Bourdon manometer method.The apparent activation energy of normal and nanocrystallization LLM-105 based PBX with decomposition extent of 0.1% was calculated based on Arrhenius formula.Non-isothermal thermal decomposition reaction kinetics of two kinds of LLM-105 based PBX was studied by TG-DSC.The results show that the apparent activation energy of normal and nanocrystallization LLM-105 based PBX explosives with decomposition extent of 0.1% obtained by Arrhenius formula is 74.67 and 138.09kJ/mol,respectively.The apparent activation energy of normal and nanocrystallization LLM-105 based PBX explosives with decomposition extent of about 50% obtained by Kissinger method is 389.26 and 215.73kJ/mol,the critical temperature of thermal explosion is 615.0and600.4K,respectively,which is consistent with the result calculated by Ozawa method.The characteristic peak temperature of two kinds of LLM-105 based PBX when heating rate towards zero is 606.94 and 586.48 K,respectively.Compared with normal LLM-105 based PBX,thermal decomposition of nanocrystallization LLM-105 based PBX explosive has higher reactivity and its thermal sensitivity is also improved.