期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 44, 页码 24282-24291出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp03479a
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资金
- [FCH-S-14-2487]
The thermal behavior, decomposition kinetics and mechanisms of 1-amino-1-(tetrazol-5-yldiazenyl) guanidine (tetrazene) and 2-(tetrazol-5-yldiazenyl) guanidine (MTX-1) have been investigated using DSC, TG techniques, and quantum chemical calculations. It has been found that MTX-1 is much more stable than tetrazene and MTX-1, and both of them decompose in three steps with different kinetic parameters. Tetrazene is melted-dehydrated at 128.4 degrees C with a heat absorption of 50 J g(-1) and then it starts to decompose at around 118.6 degrees C with a peak temperature of 126.3 degrees C covered by a heat release of 1037 J g(-1) at a heating rate of 1.0 degrees C min(-1), while MTX-1 starts at 167.7 degrees C with a main peak of 191.1 degrees C covered by a heat change of 1829 J g(-1) under the same conditions. The activation energy is almost the same for their first decomposition steps (225 kJ mol(-1)), which are controlled by a three dimensional nucleation and growth model (A3). The mechanisms of the rate-limiting steps are supported by quantum chemical calculations. They could undergo a similar rate-limiting chemical process producing 1H-tetrazole and N-2 for both cases, while the former also produces aminocyanamide and the latter produces cyanamide.
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