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Physico‐Chemical Properties of 1,3,5,7‐Tetranitro‐1,3,5,7‐Tetrazacyclooctane (HMX)
Author(s) -
Maycock J. N.,
Verneker V. R. Pai,
Lochte W.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690350235
Subject(s) - thermal decomposition , decomposition , intramolecular force , photochemistry , excitation , formaldehyde , irradiation , chemistry , radiant energy , radiation , oxide , materials science , chemical physics , organic chemistry , optics , physics , nuclear physics , quantum mechanics
The electronic absorption spectrum of β‐HMX has been measured and discussed in terms of two processes, 1. an intramolecular excitation of the group and 2. possible exciton structure. The photochemical decomposition of α‐, β‐, and γ‐polymorphic forms of HMX has been investigated and shown to be a one photon process with an associated thermal process whose energy depends on the energy of photon excitation. Irradiation with 2537 Å light produces a coloring of the crystals. A tentative model for the photo‐decomposition of HMX into formaldehyde and nitrous oxide is discussed. ‐ Radiation (2537 Å) effects on the α‐, β‐, and γ‐polymorphs of HMX have been investigated by a simultaneous DTA‐TGA technique. Shifts in both exotherms and endotherms have been found with the effects being proportional to the polymorph densities, i.e. β > α > γ for the phase change endotherms and β < α < γ for the main decomposition exotherm. A possible explanation based on the different conformational structures has been proposed for the sequential radiation damage.