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Issue 37, 2007
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A mechanism for the decomposition of dinitropropyl compounds

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Abstract

A decomposition mechanism is proposed for 2,2-dinitro-1-methoxypropane, a compound whose structure resembles the nitroplasticizer (NP) component of plastic-bonded explosive PBX 9501. A library of key reactions is presented and is based on the results of NP aging studies and existing decomposition mechanisms for similar nitro compounds. Density functional electronic structure calculations on these reactions were used to develop a decomposition mechanism at lower temperatures, which begins with HONO elimination and leads to intermediates that can produce CO, CO2, NO, and N2O gases. These gases were observed in low temperature (48 to 64 °C) aging studies of NP. A high temperature mechanism involving NO2 scission is compared to a thermal decomposition mechanism determined by simultaneous thermogravimetric modulated beam mass spectrometry. The calculated energy barriers for HONO elimination and NO2 scission in the gas phase are reported and compared to experimental results.

Graphical abstract: A mechanism for the decomposition of dinitropropyl compounds

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Article information


Submitted
21 May 2007
Accepted
13 Jul 2007
First published
02 Aug 2007

Phys. Chem. Chem. Phys., 2007,9, 5121-5126
Article type
Paper

A mechanism for the decomposition of dinitropropyl compounds

D. K. Pauler, N. J. Henson and J. D. Kress, Phys. Chem. Chem. Phys., 2007, 9, 5121
DOI: 10.1039/B707604E

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