Citation: ZHENG Xiao-Di, ZHU Yan-Li, DONG Rui, JIAO Qing-Jie. Effect of Alkyl Imidazole Ionic Liquids C_nmimCl (n= 4, 6, 8) on CL-20 Recrystallization[J]. Acta Physico-Chimica Sinica, ;2016, 32(8): 1950-1959. doi: 10.3866/PKU.WHXB201605071 shu

Effect of Alkyl Imidazole Ionic Liquids C_nmimCl (n= 4, 6, 8) on CL-20 Recrystallization

State Key Laboratory of Explosive Science and Technology, Beijing Institute of Technology, Beijing 100081, P. R. China

Received Date: 7 January 2016
Revised Date: 6 May 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (51304024).

Hexanitrohexaazaisowurtzitane (CL-20) is considered to be a representative high energy density material. It is important to control the microstructure of the crystal during recrystallization to ensure the quality of CL-20. In this study, the effects of different types and concentrations of ionic liquids on CL-20 were investigated by adding them to the solvent or anti-solvent during recrystallization. Three types of ionic liquids acting as a morphology control additive can reduce the crystal size of recrystallized CL-20. Thermal analysis shows that most ionic liquids added to solvents or anti-solvents can increase the transition temperature from the ε crystal to the γ crystal by up to 12.6 ℃, and the decomposition peak temperature increases so the thermal stability of CL-20 improves. The heat output increases to 1344 J·g^-1. When DmimCl is added into the solvent, recrystallized CL-20 has smaller particle size and an octahedral shape without sharp edges or agglomeration. With different concentrations of DmimCl in the solvent, the decomposition peak temperature of recrystallized CL-20 increases more than 6 ℃ and the heat output is more than 1100 J·g^-1. Therefore, DmimCl is an ideal morphology control additive.
- CL-20,
- Ostwald rule,
- Thermal analysis,
- Morphology control additive,
- Recrystallization,
- Ionic liquid
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Effect of Alkyl Imidazole Ionic Liquids CnmimCl (n= 4, 6, 8) on CL-20 Recrystallization

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通讯作者: 陈斌, bchen63@163.com

Effect of Alkyl Imidazole Ionic Liquids C_nmimCl (n= 4, 6, 8) on CL-20 Recrystallization