Phase diagram, solubility limit and hydrodynamic properties of cellulose in binary solvents with ionic liquid.
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 2.5-3moles per anhydroglucose unit. This proportion allows calculation of the maximal cellulose concentration soluble in EmimAc-DMSO at any composition; in EmimAc it is around 25-27wt%. 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.
Mines ParisTech, Centre de Mise en Forme des Matériaux - CEMEF(1), UMR CNRS/Ecole des Mines de Paris 7635, CS 10207, 06904 Sophia-Antipolis, France.
Kim Anh
KA
Le
Mines ParisTech, Centre de Mise en Forme des Matériaux - CEMEF(1), UMR CNRS/Ecole des Mines de Paris 7635, CS 10207, 06904 Sophia-Antipolis, France.
Cyrielle
C
Rudaz
Mines ParisTech, Centre de Mise en Forme des Matériaux - CEMEF(1), UMR CNRS/Ecole des Mines de Paris 7635, CS 10207, 06904 Sophia-Antipolis, France. Electronic address: Tatiana.Budtova@mines-paristech.fr.
Tatiana
T
Budtova
D002482:Cellulose / Q000737:chemistry*; D004121:Dimethyl Sulfoxide / Q000737:chemistry*; D057446:Hydrodynamics; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D044367:Phase Transition; D012995:Solubility; D012997:Solvents / Q000737:chemistry; D014783:Viscosity; D014867:Water / Q000737:chemistry*
D007093:Imidazoles; D052578:Ionic Liquids; D012997:Solvents; D014867:Water; D002482:Cellulose; C518739:1-ethyl-3-methylimidazolium; D004121:Dimethyl Sulfoxide
Cellulose; DMSO; Intrinsic viscosity; Ionic liquid; Phase diagram; Solubility; Water