Combustion and Thermal Decomposition of Solid Gas-Generating Compositions Based on High-Enthalpy Poly-N-Heterocyclic Compounds and Poly-2-Methyl-5-Vinyltetrazole

This paper presents a study of the macrokinetic regularities of combustion and thermal decomposition kinetics of energetic condensed compositions containing high-enthalpy high-nitrogen compounds based on the system of furazan, furoxan, and azepine cycles and poly-2-methyl-5-vinyltetrazole as an active binder. The linear rates of high-temperature transformations (combustion) of compositions with different ratios of components were determined in the nitrogen pressure range 1–6 MPa. The burning rate of compositions of polycyclic compounds and poly-2-methyl-5-vinyltetrazole was found to exceed the burning rate of individual components, with the synergistic effect increasing as the nitrogen pressure in the system is decreased. Kinetic studies of heat release during thermal decomposition of energetic compositions in the temperature range 50–350°C under isothermal and nonisothermal conditions showed that in pressed compositions, there was interaction between the reactants leading to a significant increase in the rate of thermal decomposition of the mixture relative to the rate of decomposition of individual components. The data obtained indicate that one of the reasons for an increase in the burning rate upon mixing of components may be a change in the burning-rate controlling reactions due to the chemical interaction of components of the binary composition.