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The thermal stability of the polymorphs of hexanitrohexaazaisowurtzitane, part II

✍ Scribed by M. Frances Foltz; Clifford L. Coon; Frank Garcia; Albert L. Nichols III

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
1002 KB
Volume
19
Category
Article
ISSN
0721-3115

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✦ Synopsis

Abstract

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.

📜 SIMILAR VOLUMES

The thermal stability of the polymorphs
The thermal stability of the polymorphs of hexanitrohexaazaisowurtzitane, Part I
✍ M. Frances Foltz; Clifford L. Coon; Frank Garcia; Albert L. Nichols III 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 941 KB

## Abstract 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. Described are the results of high temperature equilibrium solvation studies coupled with Fourier transform infrared spectroscopy (F