溶剂性质对六硝基六氮杂异伍兹烷晶型的作用

研究稳定地得到e型六硝基六氮杂异伍兹烷( HNIW)的结晶工艺条件，并寻求多晶转变的理论解释。研究发现，非溶剂的物理性质，如偶极矩、分子极性，在结晶过程中对于HNIW的晶型起重要作用。常温下在无晶种时，当利用乙酸乙酯、丙酮作为溶剂，采用偶极矩值小的非溶剂，如环己烷、石油醚、甲苯、异辛烷等均可使HNIW以ε型晶型结晶出来，反之，采用偶极矩值大的非溶剂，如三甘醇则使HNIW以其它晶型结晶出来。在较高温度下，s型HNIW在极性与非极性溶剂中稳定存在时间明显不同。

Influence of Anti-solvent Property on the Modes of Crystallization of HNIW

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.