Abstract
Abstract—The behavior of unsymmetrical dimethylhydrazine (UDMH), a highly toxic rocket fuel, has been studied in a supercritical water medium within a temperature range of 400–650°C by electrospray ionization high-resolution mass spectrometry. It has been established that thermal transformation leads to the formation of a wide range of products, including at least 350–400 nitrogen-containing compounds of CHN and CHNO-classes. The main products are nitrogen-containing heterocyclic compounds containing from one to three nitrogen atoms. Based on the accurate masses, the tentative identification of the most important components is given. It has been shown that 1-methyl-1H-1,2,4-triazole predominates among the transformation products at a temperature of 650°C; in this case, the predominant fraction of UDMH is converted into gaseous nitrogen.
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