Science and Technology of Energetic Materials

Vol.62, No.3 (2001)


A study on flash pyrolysis of 1H-1,2,4-triazole
Mieko Kumasaki, Yuji Wada, Yoshiaki Akutsu, Mitsuru Arai,
and Masamitsu Tamura


The decomposition behavior of 1H-1, 2, 4-triazole at low and high temperatures was studied by product gas analysis using flash pyrolysis. In case of low temperature decomposition, hydrogen cyanide and ammonia were detected as deconposition product gases. Hydrogen cyanide and methane were detected in high temperature decomposition. It was supposed that the decomposition mechanism was changed at 600—700℃ฺ
  The reaction mechanism was proposed as follows based on molecular orbital calculation. That is, singlet nitrilimine decomposed to form hydrogen cyanide and NH. On the other hand, triplet nitrilimine formed methane and the reaction path to form methane was similar to the decomposition of 1H-tetrazole. However, triazole decomposition generated no acetylene while tetrazole releasedacetylene, and methane. The diffrence could be explained by in terms of heat of formation of triazole and tetrazole.

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