Studies on thermal decomposition of composition b using different thermal analysis methods

The thermal decomposition behavior of composition B was investigated by using differential scanning calorimeter (DSC), thermogravimetric-differential thermal gravimetry analyzer (TG-DTG), dynamic vacuum stability test (DVST) and temperature-jump/Fourier transform infrared (T-Jump/FTIR) spectroscopy, respectively. The results showed that there was an endothermic and an exothermic peak between 50-400°C. The endothermic peak was in agreement with the peak of melting of TNT and the exothermic peak was in accordance with the decomposition peak of RDX. There were two mass loss stages over the temperature range from 50°C to 400°C. The mass loss of the first and second stages approached the content of TNT and RDX, respectively, which was consistent with the results of DSC analysis. The amount of decomposition gases of composition B at 100°C for 48h was 0.43 mL/g which showed composition B had a good thermal stability. The nitrogen-containing IR-active gas products were NO, NH ₃, HCN and HONO. The carbon-containing gas products were CO, CO ₂, HOCO and HCN. The curves of mole concentration fraction of the main gaseous products vs time were obtained.