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

Abstract : 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.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00960085
Contributeur : Magalie Prudon <>
Soumis le : lundi 17 mars 2014 - 15:43:47
Dernière modification le : lundi 12 novembre 2018 - 11:05:45

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Kim Anh Le, Cyrielle Rudaz, Tatiana Budtova. Phase diagram, solubility limit and hydrodynamic properties of cellulose in binary solvents with ionic liquid. Carbohydrate Polymers, Elsevier, 2014, 105, pp.237-243. ⟨10.1016/j.carbpol.2014.01.085⟩. ⟨hal-00960085⟩

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