Strontium complex nitrates of carbohydrazide as a non-azide gas generator for safer driving - the thermal behavior of the Sr complex with various oxidizing agents

Abstract

As a new azide-free gas generant, the thermal behavior of the Sr complex nitrate of carbohydrazide was investigated in the mixed system with various oxidizing agents (KClO4, KBrO3, Sr(NO3)2, KNO3). For the differential thermal analysis, the initial temperature of the reaction of mixtures with KBrO3 was lower than that of the pure complex, and the reaction was very vigorous. The reactions with oxidizing agents except for KBrO3 were thought to proceed moderately. The heat of combustion at the stoichiometric composition increased according to the tendency of the calculated theoretical value based on the chemical stoichiometric equation. The burning rate of the KBrO3 system was very high compared with the other mixed systems, and was controlled by the rate of reaction. The pressure dependence was high in the case of using the nitrate as an oxidizing agent. In all the systems, N2 and CO2 gases account for 99% of all the evolved gases during the combustion. In the case of using an oxidizing agent containing a halogen, the halogen ion was only slightly detected during the combustion.