Heat‐Resistant and Low Sensitivity Energetic Material Constructed with [1, 2, 4]Triazolo[4,3‐a]pyridine Framework

Abstract

AbstractIn this study, fused [1, 2, 4]triazolo[4,3‐a]pyridine framework was applied to construct a new energetic compound with high thermal stability and low sensitivity. 5‐Imino‐6,8‐dinitro‐2,3,5,6‐tetrahydro‐[1,2,4]triazolo[4,3‐a]pyridin‐3‐amine (6) was synthesized by a simple method and fully characterized by NMR (1H, 13C), IR, elemental analysis, differential scanning calorimetry (DSC) and thermogravimetric (TG). The structure of compound 6 was further determined by X‐ray diffraction. Physicochemical and energetic properties of the target compound, such as thermal behavior, friction sensitivity, impact sensitivity, density and detonation property, were tested. Compound 6 possesses high thermal stability (Td=337 °C), desirable insensitivity (IS >40 J, FS >360 N), positive calculated heat of formation (ΔfH=307.05 kJ mol−1) and good detonation property (D=8227 m s−1, P=26.3 GPa), which are all superior to the traditional heat‐resistant explosive HNS (Td=318 °C, IS=5 J, FS=240 N, ΔfH=78.2 kJ mol−1, D=7612 m s−1). These results imply that compound 6 has potential application as a heat‐resistant and insensitive explosive.