含能材料2012，Vol.20Issue(1)：30-34,5.DOI:10.3969/j.issn.1006-9941.2012.01.008
HNIW在乙酸乙酯-正庚烷溶剂体系中的结晶机制研究
Crystallization Mechanism of ε-HNIW in Ethyl Acetate/n-Heptane Solution
摘要
Abstract
2 ,4,6,8,10,12-Hexanitrohexaazaisowurtzitane( HNIW,or CL-20) exists in four crystalline polymorphs(α-,β-,γ- and ε-) which can be transited in different solvents at ambient conditions. In this work, the ε-HNIW crystallization process in a saturated HNIW solution in ethyl acetate being added to n-heptane with different addition rates. Crystal polymorph and morphology of HNIW were studied by Fourier transform infrare spectroscopy( FTIR) and scanning electron microscope( SEM) ,respectively. It is revealed that crystallization mechanism of ε-HNIW is kinetic-controlled when n-heptane addition rate is above 100 mL ? S-1 and the crystallization process of HNIW is that metastable phase β-HNIW nucleus firstly formed and growed; then,β→ε phase transition occurred and stable phase ε-HNIW increased; at last,β-HNIW disappeared and ε-HNIW attained completely. When n-heptane addition rate is below 20 mL ? S-1, crystallization mechanism of ε-HNIW is thermodynamic-controlled and only ε-HNIW nucleus formed and growed without phase transition in the whole crystallization process. The hydrate α-HNIW will be formed if water existed in HNIW solution. So,the non-solvents used for preparation of ε-HNIW should be non-polar or poor-polar solvents, not solvents with high values of dipole moment.关键词
物理化学/炸药/六硝基六氮杂异伍兹烷(HNIW,CL-20)/结晶机理/溶剂/反溶剂法Key words
physical chemistry/ explosive/ 2 ,4, 6,8,10,12-hexanitrohexaazaisowurtzitane ( HNIW, or CL-20 )/ crystallization mechanism/ solvent/non-solvent method分类
军事科技引用本文复制引用
李洪珍,周小清,王述存,徐容,黄明,王蔺..HNIW在乙酸乙酯-正庚烷溶剂体系中的结晶机制研究[J].含能材料,2012,20(1):30-34,5.基金项目
中国工程物理研究院科学技术基金面上项目(2010B0302040) （2010B0302040）
