Study on Thermal Decomposition and Combustion of Insensitive Explosives 3, 3-Diamino-4, 4-azofurazan (DAAzF) and 3, 3-Diamino-4, 4-azoxyfurazan (DAAF)
Thermal decomposition of a low sensitive explosives, 3, 3-diamino-4, 4-azofurazan (DAAzF) and 3, 3- diamino-4, 4-azoxyfurazan (DAAF), has been investigated under isothermal conditions at 240-320℃ and 190-235℃, correspondingly, using the thin-walled glass manometer of the compensation type. Changing the ratio of the sample weight to the vessel volume the kinetic parameters of DAAzF decomposition preferential in the solid state (k = 5.4×1011·exp(- 21260/T), s-1) and the gas phase (k = 1.93×1011·exp(-19940/T), s- 1), as well as kinetics of decomposition in the solution (k = 3.5×106· exp(-14070/T), s-1) have been measured. The preliminary study showed that the activation energy of DAAF thermal decomposition in solid state is about 44 kcal/mole and rate constants about ten times bigger than those of DAAzF. The comparison of the DAAzF and DAAF decomposition rate constants obtained under isothermal conditions with those obtained in DSC experiments shows that the DSC kinetic data describe total process of decomposition in that the gas and solid phases. Burn rate characteristics of DAAzF and DAAF have been investigated in the pressure interval of 0.1-15 MPa. The temperature distribution in the combustion waves of DAAzF and DAAF has been measured. Thermocouple measurements shows that the heat flux from the gas to the surface at pressures at least up to 5 MPa is negligible that allows considering the condensed-phase chemistry as determining one in the combustion of DAAzF. In contract to that the temperature gradient above the surface of DAAF is very significant, and it can be assumed that the leading reactions on DAAF combustion occur in the gas phase. Based on the burn rate and thermocouple measurements data, rate constants of DAAzF decomposition in the molten layer at 600-800℃ have been derived from a condensed-phase combustion model (k = 3.1·108·exp(- 16400/T), s-1), which is in a good agreement with kinetic data obtained in the solution at 235-260℃.
3, 3-diamino-4, 4-azofurazan (DAAzF) 3, 3-diamino-4, 4-azoxyfurazan (DAAF) burn rate thermal decomposition temperature profiles combustion waves
Valery SINDITSKH Manh Cuong VU Vera SHELAPUTINA Aleksei SHEREMETEV Natalia ALEXANDROVA
Mendeleev University of Chemical Technology, 9 Miusskaya Square, 125047, Moscow, Russia N.D. Zilinskiy Institute of Organic Chemistry, Russian Academy of Science, Leninsky Prosp., 47, Mosc
国际会议
西安
英文
422-428
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）