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Citation: DONG Lin-Mao, LI Xiao-Dong, YANG Rong-Jie. Thermal Decomposition Kinetics of Hexanitrohexaazaisowurtzitane by Mass Spectrometry[J]. Acta Physico-Chimica Sinica, ;2008, 24(06): 997-1001. doi: 10.3866/PKU.WHXB20080614 shu

Thermal Decomposition Kinetics of Hexanitrohexaazaisowurtzitane by Mass Spectrometry

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

Received Date: 20 November 2007
Available Online: 24 April 2008

Thermal decomposition of hexanitrohexaazaisowurtzitane (HNIW)was studied bymass spectroscopy (MS) with low impacting electron energy. Non-isothermal kinetics treating method for ion curves in mass spectroscopy was established. The mechanism of HNIW thermal decomposition was analyzed according to the Arrhenius curves of ion products. The results showed that the apparent activation energy of the HNIW thermal decomposition was 145.1 kJ·mol-1. Between 130 and 150 ℃, ion products are mainly produced by electron impact, and activation energy is between 28 and 41 kJ·mol -1. Between 213 and 228 ℃, ion products are mainly produced by thermal decomposition, and activation energy is between 143 and 179 kJ·mol-1. The kinetic compensation effect occurs in thermal decomposition of HNIWbetween 213 and 228 ℃, and the compensation effect equation is lnA=0.252Ea-0.645. The main reactions of HNIWthermal decomposition are as HNIW.438→6NO2+2HCN+HNIW.108, HNIW.438→6NO2+3HCN+HNIW.81, HNIW.438→6NO2+4HCN+HNIW.54.
- Hexanitrohexaazaisowurtzitane; Mass spectroscopy; Thermal decomposition; Kinetics
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