3-甲氧基-6-硝胺基-1, 2, 4, 5-四嗪化脲的制备, 结构与性能研究

3-Methoxy-6-nitroamino-1, 2, 4, 5-tetrazylated urea was prepared by the reaction of 3, 6-dinitroamino-1, 2, 4, 5-tetrazine (DNAT) and urea. Its structure was characterized by infrared spectroscopy, elemental analysis and nuclear magnetic resonance. The crystal structure was determined by X-ray single crystal diffraction, and the thermal properties were tested by differential scanning calorimetry (DSC), thermogravimetry-differential thermogravimetry (TG-DTG) and oxygen bombs. The impact and friction sensitivities were tested. The thermal decomposition kinetic parameters were calculated by Ozawa method and Kissinger method. Meanwhile, the critical temperature of thermal explosion was calculated by non-isothermal kinetic method. The results show that the crystal of the compound belongs to the monoclinic system, the P₂₁/n space group, the crystal density is 1. 640 g/cm³, and each unit cell contains four 3-methoxy-6-nitroamino-1, 2, 4, 5-tetrazylated urea molecules. The unit cell parameters are: a=0.71799(14)nm, b=1.8109(4)nm, c=0.95761(19)nm, β=108.02(3)°, V=1. 1840(4) nm³. The exothermic peak temperature of the compound is 147.7℃, and the formation enthalpy is -1142.63kJ/mol. The compound has an impact sensitivity (H₅₀) of 13 cm and is insensitive to frictional stimuli, which can be considered as a potential energetic compound.