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Citation: DONG Lin-Mao, LI Xiao-Dong, YANG Rong-Jie. Thermal Decomposition of Hexanitrohexaazaisowurtzitane and Its Residues[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 981-986. doi: 10.3866/PKU.WHXB20090525 shu

Thermal Decomposition of Hexanitrohexaazaisowurtzitane and Its Residues

1.
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China

Corresponding author: LI Xiao-Dong, YANG Rong-Jie, yrj@bit.edu.cn
Received Date: 22 January 2009
Available Online: 18 March 2009

Hexanitrohexaazaisowurtzitane (HNIW) particles were heated isothermally at (204.0±0.5), (208.0±0.5), (212.0±0.5), and (216.0±0.5) ℃for 10, 20, 30, 40, 50, and 60 min under (2.0±0.1) MPa pressure in an ar n atmosphere. Residues obtained at (208.0±0.5) ℃were studied by elemental analysis, scanning electron microscopy (SEM), Fourier transforminfrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetry-differential scanning calorimetry-mass spectrometry (TG-DSC-MS) and thermogravimetry-Fourier transforminfrared (TG-FTIR) spectroscopy. Results showed that after isothermal decomposition of HNIW crystals at about 210.0 ℃for 60 min residues were formed with an average molecular formula of C2H2N2O. Unreacted HNIW is present in the residue and is more thermally unstable than the original HNIW. We confirmed that HNIWcrystals decomposed stepwise under isothermal conditions. Three stages were found to exist during the thermal decomposition of HNIW residues. The first decomposition stage consists of an initial decomposition of unreacted HNIW, the second stage comprises an elimination reaction of five-membered ring amides and nitrogen heterocyclic compounds and in the third stage five-membered ring amides are degraded and secondary reactions involving NO2 occur. The main gaseous products in every stage are discussed.
- Hexanitrohexaazaisowurtzitane,
- Thermal decomposition,
- Residue,
- TG-DSC-MS,
- TG-FTIR,
- FTIR
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