A novel high-energetic and good-sensitive cocrystal composed of CL-20 and TATB by a rapid solventon-solvent method

摘要

Due to the insolubility of TATB in amajority of organic solvents, it is very difficult to prepare cocrystals of TATB. In this work, through a rapid nucleation solventon-solvent process, a novel cocrystal explosive, CL-20 (2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane)/TATB (1,3,5-triamino-2,4,6-trinitrobenzene), has been successfully prepared. The cocrystal is characterized with scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, thermogravimetric/differential scanning calorimetry (TG-DSC), and high performance liquid chromatography (HPLC). The SEM results indicate that the cocrystal particles are homogeneous with an average particle size of about 3-5 mu m, and the morphology of the cocrystal is completely different from the primary materials. XRD and Raman analyses confirm that the cocrystal has unique peak patterns with large differences from CL-20 and TATB. IR and Raman spectra suggest that hydrogen-bonding interactions exist between CL-20 and TATB molecules. The density determination, the weight loss in one step and the single exothermic peak in the thermal analysis curves further illustrate that the CL-20/TATB cocrystal is a new substance instead of independent crystallization of CL-20 and TATB. In CL-20/TATB cocrystal, the molar ratio of CL-20 and TATB is 3 : 1 determined by HPLC. Thermal analysis and detonation parameters calculation shows that the cocrystal has excellent thermal stability and high energy-release efficiency. An impact sensitivity test indicates that the sensitivity of the cocrystal is sufficiently reduced relative to CL-20. For the CL-20/TATB cocrystal, its detonation performance is superior to HMX and impact sensitivity is almost the same as HMX.