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含能材料  2011 

动态真空安定性试验方法研究(Ⅳ):HMX的热分解

DOI: 10.3969/j.issn.1006-9941.2011.06.012

Keywords: 物理化学,动态真空安定性试验(DVST),奥克托今(HMX),动力学参数,机理函数,安定性,储存寿命

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Abstract:

采用动态真空安定性试验(DVST)方法研究了奥克托今(HMX)的热分解过程,利用普适积分法和微分方程法得到了HMX热分解反应的活化能和指前因子。结果表明,不同恒温温度下HMX的热分解机理函数不同。在100~110℃范围内,HMX的热分解过程遵循三维扩散机理的Ginstling-Brounstein方程;在120~140℃范围内,遵循一维扩散机理的抛物线方程;150℃时遵循二维扩散机理的Valensi方程。HMX热分解反应速率常数k随温度的升高而增大,但不符合Van′tHoff规则。HMX在150℃以下放气量均小于2.0mL·g-1,表明HMX具有良好的热安定性。对HMX进行高温加速老化试验,以分解深度为0.1%所需时间(tT)与温度(T)的关系数据拟合Semenov方程为:lntT=12157.95/T-19.0052,据此预估25℃下HMX的储存寿命为90.6a。

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