LLM-105基PBX炸药的热分解反应动力学

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。

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

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 decomposi‐tion reaction kinetics of two kinds of LLM‐105 based PBX was studied by TG‐DSC .The results show that the ap‐parent 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 .09 kJ/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 .73 kJ/mol ,the critical temperature of thermal explosion is 615 .0 and 600 .4 K ,respectively ,which is consistent with the result calculated by Ozawa method .The characteristic peak tem‐perature of two kinds of LLM‐105 based PBX when heating rate towards zero is 606 .94 and 586 .48K ,respectively . Compared with normal LLM‐105 based PBX ,thermal decomposition of nanocrystallization LLM‐105 based PBX ex‐plosive has higher reactivity and its thermal sensitivity is also improved .