Investigation of diaminodinitroethylene (DADNE) thermal decomposition

Diaminodinitroethylene (DADNE or FOX‐7) is a low‐sensitive high explosive. The curve of the differential‐thermal analysis (DTA) of DADNE has two obvious endothermal peaks and two exothermal peaks. DTA data permitted to suppose that DADNE has several polymorph modifications, and transitions between them are observed at temperatures ∼+115 °C and ∼+170 °C. Two exothermal peaks (at +220° C and +270 °C, correspondingly) on DTA curves correspond to the processes taking place in DADNE at temperatures over +210 °C. One possible reason for appearance of these two peaks is: DADNE has polymorph modifications with substantially different thermal stability.Attempts were made to obtain metastable (under normal conditions) polymorph modifications of DADNE. To attain this, DADNE was thermally treated in vacuum. Thermoanalysis and IR‐spectroscopy demonstrated the residue on the plate to be the substance we called DADNE‐T. DADNE‐T was recrystallized to study specific features of its molecular structure. Data of thermal ana...