Abstract The thermal decomposition behavior and kinetics of CL-20/HMX co-crystal were studied by microcalorimetry at the temperature interval of 448.15–468.15 K. The thermal stability of CL-20/HMX co-crystal is mediated by the individual thermal stabilities of pure CL-20 and HMX. CL-20 has a catalytic effect on HMX decomposition. The heat flow curve of CL-20/HMX co-crystal is not a single exothermic peak, and there is an obvious inflection point when the degree of decomposition α = 50 %. The mechanism function and kinetic parameters of CL-20/HMX co-crystal are obtained. Before the inflection point, the model conforms to the Avrami-Erofeev equation, and the activation energy is 166.80 kJ mol−1. After the inflection point, the model conforms to the Jander model, and the activation energy is 174.43 kJ mol−1. The thermal decomposition process of CL-20/HMX co-crystal is not a simple superposition process, but has coupling feature. The decomposition residues are analyzed and identified by high-performance liquid chromatography, Fourier-transform infrared spectroscopy, and scanning electron microscopy, and the isothermal decomposition of CL-20/HMX co-crystal is extensively discussed.

中文翻译：

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CL-20/HMX共晶等温分解的微量热法研究

摘要 采用微量热法在 448.15–468.15 K 的温度区间研究了 CL-20/HMX 共晶的热分解行为和动力学。CL-20/HMX 共晶的热稳定性由各自的热稳定性介导。纯 CL-20 和 HMX。CL-20 对 HMX 分解有催化作用。CL-20/HMX共晶的热流曲线不是单一的放热峰，分解度α=50%时有明显的拐点。获得了CL-20/HMX共晶的机理函数和动力学参数。在拐点之前，模型符合Avrami-Erofeev方程，活化能为166.80 kJ mol-1。拐点后，模型符合Jander模型，活化能为174.43 kJ mol-1。CL-20/HMX共晶的热分解过程不是简单的叠加过程，而是具有耦合特性。通过高效液相色谱、傅里叶变换红外光谱和扫描电子显微镜对分解残留物进行了分析和鉴定，并广泛讨论了CL-20/HMX共晶的等温分解。