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在线粒度仪器在含能材料方面的应用（转载）

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FOX-7在DMSO-H2O二元混合体系中的结晶研究

Study on Crystallization of FOX-7 in DMSO-H2O Binary Mixed Solvents
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中文摘要:
      为获得不同结晶条件对1,1-二氨基-2,2-二硝基乙烯（FOX-7）晶体质量和形貌的影响规律，实现对其晶体形态的控制。使用CrystalSCAN多通道结晶仪，采用浊度法测定了20~95℃，FOX-7在二甲基亚砜（DMSO）、水(H2O)及其二元混合溶剂中的溶解度以及在DMSO/H2O=2:1（体积比）混合溶剂中的介稳区宽度。采用降温法研究了FOX-7在多种结晶条件下的晶体形态，并测试了晶体的机械感度和热性能。结果表明：FOX-7的溶解度随着温度的升高和二元混合溶剂中DMSO含量的增加而增加；介稳区宽度随着温度的升高、降温速率的减小和搅拌速率的增大而变窄。降温结晶过程中，FOX-7的晶体形态显著受溶剂比例、结晶起始温度和降温速率的影响，在50~80℃，降温速率不低于2℃?min-1的条件下，可得到长径比几乎相同、形貌规则的立方块状高品质FOX-7晶体，并且粒径在20~150μm内可控。同时，FOX-7的晶体质量越好，晶体颗粒密度越大，热分解温度越高；FOX-7的撞击感度都较低，且受颗粒形貌影响小，但摩擦感度受颗粒形貌影响较大，其中长柱状晶体的摩擦感度小、片状晶体的大。
中文关键词: 含能材料  1,1-二氨基-2,2-二硝基乙烯（FOX-7）  结晶
英文摘要:
      In order to obtain the influence of different crystallization conditions on the crystal quality and morphology of 1,1-diamino-2,2-dinitroethylene (FOX-7) crystals and realized the control of crystal characteristics. The solubility of FOX-7 in dimethyl sulfoxide (DMSO), water (H2O) and its binary mixed solvent in the range of 20~95°C and metastable zone width of binary solvent mixtures DMSO/H2O=2:1 (in volume ratio) were measured by using the CrystalSCAN multi-channel crystallizer. Crystal characteristics of FOX-7 under various crystallization conditions were investigated by cooling method, and mechanical sensitivity and thermal performance of FOX-7 were tested. The results showed that the solubility of FOX-7 increased with the increase of temperature and DMSO content in binary solvent mixtures; the width of metastable zone narrowed with increased temperature, decreased cooling rate and upgraded stirring rate. In the process of cooling crystallization, the crystal characteristics of FOX-7 is significantly affected by solvent ratio, crystallization starting temperature and cooling rate. In the range of 50~80°C, when the cooling rate is higher than 2°C?min-1, the cube-like high-quality FOX-7 crystal with almost the same aspect ratio and regular morphology was obtained, and particle diameter was controllable in the range of 20~150μm. And the better crystal quality of FOX-7, the higher crystal density and the higher thermal decomposition temperature. Impact sensitivity of FOX-7 is low and little affected by the crystal morphology, however friction sensitivity is affected more by particle morphology, the frictional sensitivity value of columnar-like crystals is smallest and that of plate-like crystals is largest.
英文关键词: Explosive  1,1-diamino-2,2-dinitroethylene (FOX-7)  Crystallize
DOI：10.11943/CJEM2018044
投稿日期:2018-02-12
后修改日期：2018-05-18
网络出版日期：2018-05-09
书版出版日期：2018-08-23
基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）
引用文献:刘璐,刘才林,杨海君,郝世龙,周小清,李洪珍,等.FOX-7在DMSO-H2O二元混合体系中的结晶研究[J].含能材料,2018,26(8):638~644
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