title: Improving Cellulose Dissolution in Ionic Liquids by Tuning the Size of the Ions: Impact of the Length of the Alkyl Chains in Tetraalkylammonium Carboxylate.
abstract: Twenty ionic liquids based on tetraalkylammonium cations and carboxylate anions have been synthesized, characterized, and tested for cellulose dissolution. The amount of cellulose dissolved in these ionic liquids depends strongly on the size of the ions: from 0 to 22 wt % cellulose can be dissolved at 90 °C. The best ionic liquids are less viscous and ammonium carboxylate based ionic liquids can dissolve as much as imidazolium-based ones. The viscosity of an ionic liquid can be decreased by the addition of DMSO as a cosolvent. After the addition of cosolvent, similar amounts of cellulose per ions are reached for most ionic liquids. As observed by rheology, ionic liquids with the longest alkyl chains form a gel when a high amount of cellulose is dissolved; this drastically limits their potential. Molecular simulations and IR spectroscopy have also been used with the aim of understanding how molecular interactions differ between efficient and inefficient ionic liquids.
authors.affiliation: CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, Université Clermont Auvergne, 63000, Clermont-Ferrand, France.
authors.forename: Xiangqian
authors.initials: X
authors.lastname: Meng
authors.affiliation: CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, Université Clermont Auvergne, 63000, Clermont-Ferrand, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Devemy
authors.affiliation: CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, Université Clermont Auvergne, 63000, Clermont-Ferrand, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Verney
authors.affiliation: CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, Université Clermont Auvergne, 63000, Clermont-Ferrand, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Gautier
authors.affiliation: CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, Université Clermont Auvergne, 63000, Clermont-Ferrand, France.
authors.forename: Pascale
authors.initials: P
authors.lastname: Husson
authors.affiliation: CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, Université Clermont Auvergne, 63000, Clermont-Ferrand, France.
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Andanson
mesh_terms: D064751:Ammonium Compounds / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D015394:Molecular Structure; D012995:Solubility; D013055:Spectrophotometry, Infrared; D013696:Temperature; D014783:Viscosity
chemical_list: D064751:Ammonium Compounds; D002264:Carboxylic Acids; D052578:Ionic Liquids; D002482:Cellulose
keywords: anions; cations; cellulose; ionic liquids; structure-activity relationships