Abstract:

2-(3-nitro-1,2,4-oxadiazole)imino-5-nitro-hexahydro-1,3,5-triazine (NONHT) and 2-(3-nitro-1,2,4-oxadiazole)imino -5-nitroso-hexahydro-1,3,5-triazine (NONsHT) were prepared by using nitration of the Mannich condensation product of NOG, tertbutylamine and formaldehyde. All of the compounds were characterized with IR, -1-H NMR, -13-C NMR, ESI-MS and elemental analysis. The thermal behaviors of NONHT and NONsHT were studied by using multiple heating differential scanning calorimeter (DSC). Their thermal decomposition kinetic parameters and thermodynamic parameters were calculated by using Kissinger, Ozawa and other methods. The results show that the thermal stability of NONHT is better than that of NONsHT. Their much higher decomposition temperatures than NNHT indicate that the introduction of 3-nitro-1,2,4-oxadiazole ring can improve the thermal stability significantly.

Key words: ordnance science and technology, energetic material, differential scanning calorimeter, 1,2,4-oxadiazole, iso-furazan, mannich reaction, nitrolysis