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Viscosity of cellulose-imidazolium-based ionic liquid solutions.
Romain Sescousse1, Kim Anh Le, Michael E Ries
1Mines ParisTech, Centre de Mise en Forme des Matèriaux-CEMEF, UMR CNRS/Ecole des Mines de Paris 7635, BP 207, 06904 Sophia-Antipolis, France.
The Journal of Physical Chemistry. B
|May 14, 2010
Summary
Microcrystalline cellulose viscosity in ionic liquids like EMIMAc and BMIMCl was studied. Cellulose-EMIMAc solution viscosity follows the Vogel-Tamman-Fulcher model, with activation energies depending on polymer concentration.
Area of Science:
- Polymer Science
- Physical Chemistry
- Materials Science
Background:
- Microcrystalline cellulose is a key biopolymer with diverse applications.
- Ionic liquids offer unique solvation properties for biopolymers like cellulose.
- Understanding cellulose-ionic liquid interactions is crucial for developing new materials and processes.
Purpose of the Study:
- To investigate the viscosity of microcrystalline cellulose in two ionic liquids: 1-ethyl-3-methylimidazolium acetate (EMIMAc) and 1-butyl-3-methylimidazolium chloride (BMIMCl).
- To compare the hydrodynamic properties and viscous flow activation energies of cellulose in these solvents.
- To analyze the temperature and concentration dependence of cellulose solutions and explore suitable models for viscosity behavior.
Main Methods:
- Viscosity measurements of microcrystalline cellulose solutions at varying concentrations and temperatures.
- Determination of intrinsic viscosities using the Huggins equation.
- Calculation of activation energies for viscous flow using Arrhenius and Vogel-Tamman-Fulcher (VTF) models.
- Analysis of the concentration dependence of activation energies via power-law functions.
Main Results:
- Intrinsic viscosity of cellulose decreased with increasing temperature in both EMIMAc and BMIMCl, indicating reduced solvent thermodynamic quality.
- Cellulose-EMIMAc solutions exhibited a concave Arrhenius plot, necessitating the use of the VTF approach.
- An improved data analysis method for VTF constants was proposed and validated.
- Viscosity of cellulose-EMIMAc solutions was found to obey VTF formalism.
- Both Arrhenius and VTF pseudo-activation energies showed a power-law dependence on polymer concentration.
Conclusions:
- The study provides detailed insights into the rheological behavior of microcrystalline cellulose in EMIMAc and BMIMCl.
- The findings highlight the applicability of the VTF model for cellulose-EMIMAc solutions and offer a refined method for parameter determination.
- The power-law relationship between activation energies and polymer concentration offers a predictive framework for cellulose-ionic liquid systems.
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