A novel type of 4,4′,5,5′-tetranitro-1H,1′H-(2,2′-biimidazole)-1,1′-diamine (DATNBI)/TNT energetic cocrystal (cocrystal-1) was prepared by the solvent evaporation method. The molar ratio of the cocrystal is 1:2 and the crystal density is 1.784 g cm−3 at 23°C. It belongs to the triclinic system with space group P
1. The thermal stability, mechanical sensitivity and detonation performance of cocrystal-1 were studied. Compared with DATNBI, the mechanical sensitivity (H
50 and FS, friction sensitivity) and thermal stability (T
d, detonation temperature) of cocrystal-1 were significantly improved (H
50, FS and T
d of DATNBI and cocrystal-1 are, respectively, 27.8 cm, 160 N, 240°C and 65.6 cm, >360 N, 253°C). Combining these results with other characterizations, it was found that cocrystal-1 exhibited a polymorphic transformation, phase separation and melting of the two single components in succession. The ability to control the properties and understand the structural stability of this explosive cocrystal is of great value.
采用溶剂蒸发法制备了一种新型的 4,4′,5,5′-四硝基-1H,1′H-(2,2′-双咪唑)-1,1′-二胺(DATNBI)/TNT 高能共晶体(共晶体-1)。该共晶体的摩尔比为 1:2,23°C 时的晶体密度为 1.784 g cm-3。它属于三菱系,空间群为 P
1.对 cocrystal-1 的热稳定性、机械敏感性和起爆性能进行了研究。与 DATNBI 相比,cocrystal-1 的机械灵敏度(H
50 和 FS,摩擦敏感性)和热稳定性(T
d,起爆温度)均有明显改善(H
50、FS 和 T
d分别为 27.8 cm、160 N、240°C 和 65.6 cm、360 N、253°C)。将这些结果与其他表征相结合,可以发现 cocrystal-1 表现出多晶型转变、相分离以及两种单一成分相继熔化。能够控制这种爆炸性共晶体的特性并了解其结构稳定性具有重要价值。