Thermal Decomposition of Energetic Materials: TNCHP, TNAZ, 24DNI, ANTA, DNBT and HMX
Final rept. Jul 95-Dec 97
SANDIA NATIONAL LABS LIVERMORE CA COMBUSTION RESEARCH FACILITY
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The physical and chemical processes that control the thermal decomposition of several different types of energetic materials have been determined from measurements with a simultaneous thermogravimetric modulated beam mass spectrometer STMBMS. The compounds studied include HMX, hexahydro-1-nitroso-3,5-dinitro-s-triazine ONDNTA, 2,4-dinitroimidazole 24DNI, TNAZ, 1-nitro-3,3-dinitroazetidine NDNAZ, 3-amino-5-nitro-1,2,4-triazole ANTA, 5,5-dinitro-3,3-bi-1,2,4-triazole DNBT, and a complex of DNBT.2ANTA. The results on HMX provide new insights on the solid-phase decomposition processes that take place within individual particles. The results on ONDNTA provide new insight to the reaction mechanisms that control the decomposition of this important cyclic nitramine reaction intermediate. The results on 24DNI, TNAZ, and NDNAZ provide sufficient data to construct a model of the underlying chemical and physical processes. A model has been formulated to represent the decomposition of 24DNI and the parameters for the model have been determined from the STMBMS results. The model consists of seven different physical processes, which include the nucleation and growth of a polymeric residue that acts as an autocatalyst. Global chemical reactions are used in each step. A qualitative model of the thermal decomposition of TNAZ and NDNAZ is presented. Sufficient data has been collected to formulate mathematical models of their decomposition.
- Organic Chemistry
- Ammunition and Explosives