Viscosity of cellulose-imidazolium-based ionic liquid solutions

Romain Sescousse 1 Kim Anh Le 1 Michael E. Ries 2 Tatiana Budtova 1
1 CEMEF - Centre de Mise en Forme des Matériaux
2 School of Physics and Astronomy [Leeds]
Abstract : The viscosities of microcrystalline cellulose dissolved in 1-ethyl-3-methylimidazolium acetate (EMIMAc) and in 1-butyl-3-methylimidazolium chloride (BMIMCI) were studied in detail as a function of polymer concentration and temperature. The goal was to compare the flow of solutions, macromolecule hydrodynamic properties in each solvent, and the activation energies of viscous flow. Intrinsic viscosities were determined using the truncated form of the general Huggins equation. In both solvents cellulose intrinsic viscosity decreases with increasing temperature, indicating the decrease of solvent thermodynamic quality. The activation energies for both types of cellulose solutions were calculated. For cellulose-EMIMAc the Arrhenius plot showed a concave shape, and thus the Vogel-Tamman-Fulcher (VTF) approach was used. We suggest an improved method of data analysis for the determination of VTF constants and demonstrate that cellulose EMIMAc solution viscosity obeys VTF formalism. Once the dependences of Arrhenius activation energy and VTF pseudo-activation energy were obtained for the whole range of concentrations studied, they were all shown to be described by a simple Power-law function of Polymer concentration.
Keywords : 1-Butyl-3-methylimidazolium chloride Arrhenius activation energy Cellulose solutions Concave shape Data analysis Huggins equation Hydrodynamic properties Imidazolium-based ionic liquid Improved methods Intrinsic viscosity Microcrystalline cellulose Polymer concentrations Power-law functions Solution viscosity Thermodynamic quality
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00509754
Contributeur : Magalie Prudon <>
Soumis le : lundi 16 août 2010 - 11:10:24
Dernière modification le : lundi 17 février 2020 - 17:43:40

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Romain Sescousse, Kim Anh Le, Michael E. Ries, Tatiana Budtova. Viscosity of cellulose-imidazolium-based ionic liquid solutions. Journal of Physical Chemistry B, American Chemical Society, 2010, 114 (21), pp.Pages 7222-7228. ⟨10.1021/jp1024203⟩. ⟨hal-00509754⟩

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