The Properties of Choline Chloride-based Deep Eutectic Solvents and their Performance in the Dissolution of Cellulose

被引:9
作者
Ren, Hongwei [1 ,2 ]
Chen, Chunmao [1 ]
Wang, Qinghong [1 ]
Zhao, Dishun [2 ]
Guo, Shaohui [1 ]
机构
[1] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
[2] Hebei Univ Sci & Technol, Sch Sci, Shijiazhuang 050018, Peoples R China
来源
BIORESOURCES | 2016年 / 11卷 / 02期
基金
中国国家自然科学基金;
关键词
Deep eutectic solvents; Cellulose; Dissolution; Choline chloride; Cosolvent; TEMPERATURE IONIC LIQUIDS; LIGNOCELLULOSIC BIOMASS; MIXTURES; PRETREATMENT; SOLUBILIZATION; CHALLENGES; COSOLVENT; CHEMISTRY; VISCOSITY; DESIGN;
D O I
暂无
中图分类号
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号
0805 ; 080502 ; 0822 ;
摘要
A series of choline chloride-based deep eutectic solvents (ChCl-DESs) were synthesized and characterized, and their performance in the dissolution of cellulose was investigated. The hydrogen-bond donors significantly (beta-value) affected the properties of ChCl-DESs, causing differentiated dissolution performances. ChCl-imidazole (Im) showed the highest Hammett acidity function (1.869), hydrogen bond basicity (0.864), and dipolarity/polarizability effect (0.382) among the ChCl-DESs. The ChCl-Im showed the lowest pseudo-activation energy for viscous flow (31.76 kJ mol(-1)) among the ChCl-DESs. The properties of ChCl-Im caused the highest solubility of cellulose (2.48 wt.%) relative to the other ChCl-DESs. Polyethylene glycol (PEG), as a co-solvent, significantly (beta-value) enhanced the accessibility of ChCl-Im to cellulose by breaking the supramolecular structure of cellulose, promoting its dissolution. The decrystallization of ChCl-Im-coupled PEG approximately doubled the dissolving capabilities, and the solubility increased by more than 80% in comparison with only ChCl-Im. The cellulose was directly dissolved by ChCl-Im-coupled PEG, and no other derivatives were produced.
引用
收藏
页码:5435 / 5451
页数:17
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