Synthesis and Characterization of Potassium Tetrakis (3-Nitro-1,2,4-Triazolyl) Borate

Using potassium borohydride and 3-nitro-1,2,4-triazole as raw materials, a new boron-containing high-energy compound, potassium tetrakis（3-nitro-1,2,4-triazolyl）borate was synthesized through substitution reaction. Its structure and morphology were characterized by infrared spectroscopy, X-ray energy spectroscopy（EDS）, X-ray photoelectron spectroscopy（XPS）, etc. The results show that the morphology of potassium tetrakis（3-nitro-1,2,4-triazolyl）borate is amorphous flocculent, with the structural characteristics of boron-containing energetic materials. Using differential scanning calorimetry（DSC）, oxygen bomb calorimetry and the law of thermodynamics to study its thermal properties and calculate its thermal decomposition kinetic parameters, the results show that there is only one decomposition heat peak in the DSC curve with a peak temperature of 338.7 ℃, indicating that it has good thermal stability. The average value of its activation energy E is 228.24 kJ·mol^-1, and the pre-exponential factor A is 1.98×10¹⁰ min^-1, and the calculated standard enthalpy of formation of potassium tetrakis（3-nitro-1,2,4-triazolyl）borate is 1 841.61 kJ·mol^-1. Using the EXPLO5（V6.02） program, the density is predicted to be 1.872 5 g·cm^-3, the detonation velocity is 8 042 m·s^-1, the detonation pressure is 36.4 GPa, and the specific impulse is 2 843.2 N·s·kg^-1.