Thermal Decomposition of RDX/AP by TG-DSC-MS-FTIR

摘要

The method of TG/DSC-MS-FTIR simultaneous analysis has been used to study the thermal decomposition mechanism of the RDX/AP (1/2) mixture. TG-DSC showed that there were two weight loss processes for thermal decomposition of RDX/AP. The first one was mainly ascribed to the thermal decomposition of RDX. Addition of AP to RDX causes decomposition to take place abruptly, after melting, resulting in a very sharp and strong peak at lower temperature. The apparent activation energies, calculated by model-free Friedman method, of this process were negative. The second mass loss process of RDX/AP was confirmed to be the thermal decomposition of AP, catalyzed by RDX. This process can be divided into three stages, which were an n~(st)-order auto-catalytic and two one-dimensional diffusions stages, respectively. There was a competition between the formation reaction of N_2O, HNCO and HCl for the first stage and between NO_2 and N_2O for the latter two stages. The product of N_2O dominated in the second stage, while NO_2 in the third stage.