Research Progress on Thermal Reactivity and Thermolysis Mechanisms of CL-20

The 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) is considered as the most promising energetic materials (EMs) in terms of its detonation performance. Nonetheless, its applications are limited due to high sensitivity and low phase stability. Thermal decomposition behavior especially for the initial reaction pathway determines its reactivity and sensitivity. An in-depth discernment of the innate decomposition pathways of CL-20 would facilitate the precision tailoring and augmentation of its performance. The thermal behavior and decomposition mechanisms of CL-20 are largely dependent on the experimental conditions and chemical environments. In this brief review, the effects of those factors on the thermal decomposition mechanisms of CL-20 are summarized from both theoretical and experimental perspectives. In particular, the interaction mechanisms between CL-20 and the other commonly used energetic compounds are simultaneously elucidated.