Phase diagram, solubility limit and hydrodynamic properties of cellulose in binary solvents with ionic liquid

被引：67
作者：
Le, Kim Anh [1 ]
Rudaz, Cyrielle [1 ]
Budtova, Tatiana [1 ]
机构：
[1] UMR CNRS Ecole Mines Paris 7635, Ctr Mise Forme Mat CEMEF, Mines ParisTech, F-06904 Sophia Antipolis, France
来源：
CARBOHYDRATE POLYMERS | 2014年 / 105卷
关键词：
Cellulose; Ionic liquid; DMSO; Water; Phase diagram; Intrinsic viscosity; Solubility; MOLECULAR-DYNAMICS; RHEOLOGICAL PROPERTIES; DISSOLUTION; VISCOSITY; NMR; POLYSACCHARIDES; COSOLVENT; MECHANISM; CHLORIDE; DILUTE;
D O I：
10.1016/j.carbpol.2014.01.085
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Cellulose solubility phase diagrams in two binary solvents based on 1-ethyl-3-methylimidazolium acetate (EmimAc) mixed with water and with dimethylsulfoxide (DMSO) were built. The minimal amount of EmimAc molecules needed to dissolve cellulose is 2.5-3 moles per anhydroglucose unit. This proportion allows calculation of the maximal cellulose concentration soluble in EmimAc-DMSO at any composition; in EmimAc it is around 25-27 wt%. Water forms hydrogen bonds with EmimAc and thus competes with cellulose for ionic liquid; the solubility of cellulose in EmimAc-water is much lower than that in EmimAc-DMSO. Hydrodynamic properties of cellulose in two solvent systems were compared. In EmimAc-DMSO cellulose intrinsic viscosity practically does not depend on DMSO content as predicted by the phase diagram. The intrinsic viscosity in EmimAc-water first increases with water content due to cellulose self-aggregation and then abruptly decreases due to coagulation. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：237 / 243
页数：7
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