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Tailored Media for Homogeneous Cellulose Chemistry: Ionic Liquid/Co‐Solvent Mixtures
Author(s) -
Gericke Martin,
Liebert Tim,
Seoud Omar A. El,
Heinze Thomas
Publication year - 2011
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201000330
Subject(s) - ionic liquid , cellulose , solvent , miscibility , reagent , dissolution , polar , organic chemistry , derivatization , viscosity , homogeneous , dimethylacetamide , materials science , chemistry , chemical engineering , thermodynamics , polymer , high performance liquid chromatography , catalysis , physics , astronomy , engineering , composite material
Co‐solvents can minimize two of the major problems associated with the use of ionic liquids (ILs) as solvents for homogeneous derivatization of cellulose: high viscosity and limited miscibility with non‐polar reagents or reaction products. Thus, the effects of 18 solvents and 3 binary solvent mixtures on cellulose solutions in three ILs were systematically studied with respect to the solution phase behavior. The applicable limits of these mixtures were evaluated and general guidelines for the use of co‐solvents in cellulose chemistry could be advanced: Appropriate co‐solvents should have $E_{{\rm T}}^{{\rm N}} $ values (normalized empirical polarity) > 0.3, very low “acidity” ( α < 0.5), and relatively high “basicity” ( β ≥ 0.4). Moreover, novel promising co‐solvents and binary co‐solvent mixtures were identified.