期刊
CARBOHYDRATE POLYMERS
卷 105, 期 -, 页码 237-243出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.01.085
关键词
Cellulose; Ionic liquid; DMSO; Water; Phase diagram; Intrinsic viscosity; Solubility
资金
- European Union [214653]
- ANR, project Nanocel [ANR-09-HABISOL-010]
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.
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