engleski

TKX-50

TKX-50 (bishydroxylammonium 5, 5’-bis(tetrazolate-1N-oxide)) is one of the most promising ionic salts as a possible replacement for RDX. The compound can be prepared on a multigram scale by the reaction of 5, 5’-(1-hydroxytetrazole) with dimethyl amine to form the bis(dimethylammonium) 5, 5’-(tetrazolate-1N-oxide) salt which is then isolated, purified and subsequently reacted in boiling water with two equivalents of hydroxyammonium chloride to form TKX-50, dimethylammonium chloride and HCl. The thermal behavior of TKX-50 (bishydroxylammonium 5, 5’-(tetrazolate-1N-oxide)) and the kinetics of its thermal decomposition were studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). It was found that the thermal decomposition of TKX-50 starts at 210-250°C depending on heating rate, preceded by an endothermic process in the range 130-200°C. By applying multiple heating rate DSC measurements and Ozawa´s isoconversional model free method the activation energy of 143, 2 kJ/mol, and pre-exponential factor of 1.99 • 10^12 s-1 were calculated from DSC peak maximum temperature - heating rate relationship. By applying nonisothermal TGA experiments and the Flynn–Wall isoconversional model free method, it was found that the activation energy changes with conversion and lies between 145 and 181 kJ/mol, while the pre-exponential factor ranges from 9.81 •10^11 to 1.79•10^16 s-1.

Bishydroxylammonium 5; 5’-(tetrazolate-1N-oxide); differential scanning

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