Borohydride Catalysis of Nitramine Thermal Decomposition and Combustion II. Thermal Decomposition of Catalyzed and Uncatalyzed HMX Propellant Formulations.

摘要

The report describes GC-MS studies on thermal decomposition of HMX, RDX and propellants, with and without catalysis by K2B12H12 or K2B10H10. This work differs from previous work in that it emphasizes the less-volatile decomposition products. Pyrolysis-GC-MS on HMX-GAP and HMX-PEG compositions with and without K2B10H10 has been carried out. Identification of products is in progress; identification of a number of products is discussed. To date, the most mechanically important product identified is probably 1,3,5-triazine. This is believed to be formed from HMX via 1,3,57-tetraazacycloocta-tetraene; this is consistent with the known thermal decomposition behavior of cyclooctatetraene and its azaderivatives. 1,3,5-triazine formation by trimerization of HCN is believed to be relatively unimportant. There is also an unknown component whose highest mass peak is at m/e 70. In addition, further analysis of results from earlier runs on RDX and RDX-K2B12H12 mixtures has been carried out. Based on all of the above, it appears that formation of the m/e 70 unknown decreases with increasing temperature. (aw)