Thermal decomposition study of HNIW by synchrotron photoionization mass spectrometry

Linmao Dong, Xiaodong Li, Rongjie Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Thermal decomposition of hexanitrohexaazaisowurtzitane (HNIW) was investigated through tuneable vacuum ultraviolet photoionization with molecular-beam sampling mass spectrometry (MBMS). According to photoionization efficiency (PIE) spectroscopic results, the initial decomposition products of HNIW were identified including HCN, CO, NO, HNCO, N 2O, CO 2 (a little), NO 2, C 2H 2N 2, C 3H 3N 3, C 4H 3N 3, C 3H 4N 4, C 5H 4N 4, C 5H 5N 5 and C 6H 6N 6. The possible ionization energies of C 2H 2N 2, C 4H 3N 3, C 3H 4N 4 and C 6H 6N 6 were analyzed on basis of the PIE spectra. The data were compared with those of thermogravimetry-mass spectrometry (TG-MS) and thermogravimetry-Fourier transform-infrared spectroscopy (TG-FT-IR). The kinetic parameters for the formation of HNCO, HCN and CO 2 were calculated from the current curves of species by TG-FT-IR spectroscopy, typically the apparent activation energy (E a) and prefactor (A) for HNCO were E a=161.3±2.5kJ mol -1 and A=38.9±0.6 s -1 with an optimal mechanism function f(α)=(1-α). Global thermal decomposition reaction and Arrhenius equation of HNIW were suggested at the end.

Original languageEnglish
Pages (from-to)493-498
Number of pages6
JournalPropellants, Explosives, Pyrotechnics
Volume36
Issue number6
DOIs
Publication statusPublished - Dec 2011

Keywords

  • Hexanitrohexaazaisowurtzitane
  • Molecular-beam Sampling Mass Spectrometry
  • TG Mass Spectrometry
  • TG-FT-IR Spectroscopy
  • Thermal Analysis

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