Thermal decomposition of energetic materials
作者： Y. Oyumi , T.B. Brill , A.L. Rheingold
DOI: 10.1016/0040-6031(87)80042-4
关键词: X-ray crystallography 、 Monoclinic crystal system 、 Crystal structure 、 Melting point 、 Crystallography 、 Thermal decomposition 、 Chemistry 、 Nucleation 、 Infrared spectroscopy 、 Stereochemistry 、 Phase (matter)
摘要: Abstract The linear secondary nitramine, 1,7-dimethyl-1,3,5,7-tetranitrotrimethylenetetramine CH 3 [N(NO 2 )CH ] N(NO (OHMX) and its cyclic analog, octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine, (CH NNO ) 4 (HMX) are compared. By IR spectroscopy DTA, OHMX is found to exist in five polymorphs between 273 K melting point at 490 K. spectra suggest that the structural differences involve mostly NO groups changes lattice symmetry without a significant alteration conformation of backbone. kinetic parameters for OHMX(III → IV) phase transition first order ( E = 50.8 kcal mol −1 comparable those HMX. nucleation process probably being measured. values Δ H transitions (0.8–2.1 also similar molecular structure OHMX(II) was determined: monoclinic, P 1 / c , 20.952(7), b 9.477(2), 6.521(2) A, β 96.29(3)°, Z 4, D calc 1.598 g cm −3 R F 3.84, wF 4.68%. It consists helical chain units staggered approximately 120° intervals. A pseudo-C axis present. slightly less thermally stable than High-rate thermolysis (d T /d t =110 s liberates products same, with few exceptions, as Competitive N-N C-N bonds fission occurs predicted by data structure. pressure dependence decomposition indicates heterogeneous gas-condensed reactions occur greater extent increases.
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