TKX⁃55在常压与高压下的热分解特性

The thermal decomposition properties of 5, 5 '-bis(2, 4, 6-trinitrophenyl)-2, 2 '-bi(1, 3, 4-oxadiazole)(TKX-55)at normal pressure(0.1 MPa)and high pressure(5.0 MPa)were studied by differential scanning calorimetry(DSC)and thermogravi- metric analusis(TG). The thermal decomposition kinetic parameters of TKX-55 at normal pressure were calculated by Kissing- er's method and Ozawa 's method and compared with those of hexanitrostilbene(HNS)to study the correlation between molec- ular structure and its properties. Results show that compared with normal pressure state, the shape of exothermal peak of thermal decomposition behavior of TKX-55 under high pressure is sharper. Under the high pressure environment(5.0 MPa), TKX-55 still maintains high thermal stability. The initial decomposition temperature is 355.69℃, which is about 35℃ higher than the initial decomposition temperature of HNS. With increasing the heating rate, the decomposition peak temperature of TKX-55 and HNS is shifted to high temperature, and the decomposition peak temperature of TKX-55 at different heating rates is obviously higher than that of HNS. The decomposition. activation energy of TKX-55 obtained by integral isoconversional non-linear method (NL-INT method)is 233.71 kJ•mol^-1 and the decomposition. activation energy of HNS is 197.87 kJ•mol^-1. The decomposition activation energy of TKX-55 is obviously higher than HNS, indicating that TKX-55 has more excellent thermal stability than HNS.