Study on Thermal Decomposition Kinetics of Hexanitrohexaazaisowurtzitane

The thermal decomposition process of hexanitrohexaazaisowurtzitane (HNIW, CL 20) under the conditions of vacuum was investigated by using a highly sensitive Bourdon manometer. The relationship between the time ( τ ) corresponding to the reacted fraction 0.1% and the temperature ( T ) of the thermal decomposition of CL 20 in the temperature range 110～140 ℃ can be expressed by the following equation: lg τ =-24.330 0+9 971.76/ T . Therefore the formal kinetic parameters E a and A , and available life at 70 ℃ were obtained, indicating that CL 20 has good thermal stability at higher temperature.