碳酸丙烯酯中HMX结晶形貌及其机理

Experimental Research and Mechanism on Re-crystallization of HMX in PC Solvent

为了获得无孪晶和形貌一致的HMX晶体,采用碳酸丙烯酯(PC)对普通HMX进行重结晶,研究不同实验条件对晶体形貌的影响;通过光学显微镜分析重结晶样品HMX结晶形貌,发现长时间结晶可以使晶体平均粒径达到2000μm;加入晶种和少量水,晶体偏向于球形化;只加入晶种,得到的晶体形貌比较一致。研究HMX晶面结构发现:PC溶剂容易与(100)面发生强的弱相互作用致使该晶面无法生长,因此PC结晶得到的晶体大都含有(100)面。

Four contrastive experiments were carried out to study HMX re-crystallization morphology in propene carbonate solvent on different experimental conditions. Morphology of re-crystallization sample was obtained by optical microscope （OMS）. OMS result show long-time crystallization can make crystal average particle size up to 2000 μm. Adding crystal seeds can avoid twin crystal and get uniform crystal morphology. Addition of crystal seeds and a little water makes morphology of crystal tend to be spherical. Morphology of crystal is more uniform if seeds exist. Crystal face of （100） always exists among the HMX crystal form from PC through simulution of the crystal structure.