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 language | English |
|---|---|
| Pages (from-to) | 493-498 |
| Number of pages | 6 |
| Journal | Propellants, Explosives, Pyrotechnics |
| Volume | 36 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Dec 2011 |
Keywords
- Hexanitrohexaazaisowurtzitane
- Molecular-beam Sampling Mass Spectrometry
- TG Mass Spectrometry
- TG-FT-IR Spectroscopy
- Thermal Analysis