压力作用下 DNTF 的热分解动力学及机理研究

In order to study the effect of pressure on the thermal decomposition of 3,4-dinitrofurazan oxyfurazan(DNTF),the decomposition properties and mechanism of DNTF under different pressures were explored from both experimental analysis and kinetic simulation.The thermal decomposition properties of DNTF at 0.1,1.0,2.0,4.0,and 6.0 MPa were investigated by means of high pressure differential scanning calorimetry(PDSC),and its thermal decomposition kinetic parameters were obtained through Kissinger equation.Simultaneous thermal analysis-FTIR-Mass spectrometry(TG/ DSC-FTIR-MS)was used to study the composition and types of decomposition products of DNTF,and to speculate the thermal decomposition mechanism.Thermal decomposition kinetics parameters of DNTF under different pressures were obtained via NETZSCH Thermokinetics Software.The results show that with the pressure increasing,the decomposition peak temperature of DNTF would move slightly to the high temperature,and gaseous products would promote the decomposition of condensed phase products more significantly.In the thermal decomposition process of DNTF,N—O bond in rings is broken first to generate catalytic gaseous nitrogen oxides(NO,N₂O).Through autocatalytic reaction,C—NO₂ bond is broken,and segments of furoxan rings as well as oxidized furoxan rings are further decomposed to generate small gaseous molecules such as CO₂,NO,NO₂ and N₂O.The thermal decomposition mechanism of DNTF is verified by kinetic simulation.