关键词: 分析化学 , 六硝基六氮杂异伍兹烷 , 结晶 , 偶极矩 , 分子极性 , 非溶剂

Abstract: A study on the methods and processes of crystallization of e-HNIW was given, and a theoretical ex?planation oi its crystal transformation was found m this paper. The solubility of HNIW almost does not change with variations in the temperature of solution. Therefore only the anti-solvents involved in crystallization is effec?tive in the preparation of e-HNIW. It is revealed that the physical properties such as the dipole moment and molecular polarity of the anti-solvent play an important role in the process of crystallization of HNIW. When us?ing acetic ether or acetone as the solvents, anti-solvents with lower values of dipole moment, for example petroleum ether, isooctane, cyciohexane, toluene etc, make the HNIW to form an e-modification, whereas anti?solvents with higher values of dipole moment, such as triethylene glycol, to form other modifications of HNIW. At higher temperatures, the duration that e-HNIW can keep its modification is longer in non-polar solvents than in polar solvents.

Key words: analytical chemistry , HNIW , crystallization , dipole moment , molecular polarity , anti-solvent