Decomposition kinetics are determined for HMX (nitramine octahydro-1,3,5,7-tetranitro- 1,3,5,7-tetrazocine) and CP (2-(5-cyanotetrazalato) pentaammine cobalt (III) perchlorate) separatelyand together. For high levels of thermal stress, the two materials decompose faster as a mixture than individually. This effect is observedboth in high-temperature thermal analysis experiments and in long-term thermal aging experiments. An Arrhenius plot of the 10% level of HMX decomposition by itself from a diverse set of experiments is linear from120 to 260 degrees C, with an apparent activation energy of 165 kJ/mol. Similar but less extensive thermal analysis data for the mixture suggests a slightly lower activation energy for the mixture, and an analogous extrapolation is consistent with the amount of gas observed inthe long-term detonator aging experiments, which is about 30 times greater than expected from HMX by itself for 50 months at 100 degrees C.
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