The thermal stability of the polymorphs of hexanitrohexaazaisowurtzitane, part II

The thermal stability of the polymorphs of hexanitrohexaazaisowurtzitane, part II

Solid‐solid phase transitions in the α‐, β‐, γ‐, and ϵ‐polymorphs of 2,4,6,8,10,12‐hexanitrohexaazaisowurtzitane (HNIW) have been studied as a function of temperature. Techniques employed include differential scanning calorimetry (DSC), differential thermal analysis/thermogravimetric analysis (DTA/T...

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Veröffentlicht in:Propellants, explosives, pyrotechnics explosives, pyrotechnics, 1994-06, Vol.19 (3), p.133-144
Hauptverfasser: Foltz, M. Frances, Coon, Clifford L., Garcia, Frank, Nichols III, Albert L.
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container_issue 3
container_start_page 133
container_title Propellants, explosives, pyrotechnics
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creator Foltz, M. Frances
Coon, Clifford L.
Garcia, Frank
Nichols III, Albert L.
description Solid‐solid phase transitions in the α‐, β‐, γ‐, and ϵ‐polymorphs of 2,4,6,8,10,12‐hexanitrohexaazaisowurtzitane (HNIW) have been studied as a function of temperature. Techniques employed include differential scanning calorimetry (DSC), differential thermal analysis/thermogravimetric analysis (DTA/TGA), and hot stage microscope analysis. Fourier transform infrared spectroscopy (FTIR) was used to identify results of polymorphic conversion. Results corroborate those(2) of Part I that the existence of multiple α‐hydrate phases complicates definition of the HNIW P‐T phase diagram. A high temperature endothermic DSC response was determined by FTIR spectroscopy to be the β → γ transition, not a conversion to a new high temperature “delta” phase. The role of water in the shifting this conversion to higher temperature is discussed.
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