Application In Situ FTIR Diffuse Reflection Spectroscopy in study of Thermal Decomposition of HMX Energetic Materials

摘要

In situ FTIR spectroscope is a kind of rising and dynamic technique. The technique, which combines the advantages of in situ investigation and accurate structure analysis in FTIR spectroscopy can detect the chemical change of materials in different temperatures with real time and obtain the relationship between micromechanism of materials and temperature. In this paper, thermal decomposition of octahydro-1, 3, 5, 7-tetranitro- 1,3,5,7-tetrazocine (HMX) heated with 5°C/min was investigated by in-situ diffuse reflection FTIR spectroscopy . The results demonstrate the rupture rate of C-N bond is faster than that of N-N bond with increasing temperature, which verifies that the cleavage of C-N bond is dominant rupture form. The increase in tension of HMX cyclic confirms that intramolecular cyclization occurs in breakage of HMX. Eight kinds of gaseous products, CO_2, N_2O, CO, NO, HCHO, HONO, NO_2 and HCN were determined. According to the change of C-N bond in condensed phase, the decomposition kinetic equation of HMX is k_(C-N) = e~(34.6)exp(-152/RT).