Thermal and viscoelastic properties of cellulosic gels with different ionic liquids and coagulation agents
Journal article, 2013

Thermal and viscoelastic properties of three-component gels consisting of microcrystalline cellulose, ionic liquid, and coagulation agent were studied. The amount and type of components was varied to obtain different gel properties. The absorption of coagulation agent (13 to 35 %wt of water or ethanol) was found to depend on the types of ionic liquid and cellulose. Surface hydrophobization of cellulose prior to preparation of the gel remarkably resulted in the gels containing the most coagulation agent (35%wt). Rheological studies indicated a linear viscoelastic behavior in storage modulus but not in loss modulus, which is a behavior that, according to our knowledge, has not been seen before for gels. Increasing the cellulose concentration from 1:20 to 1:10 increased the stiffness of the gels. The highest critical stress value (1050 Pa) was obtained for a gel containing 1-butyl-3-methylimidazolium chloride and water. Finally, it was confirmed by dynamic-mechanical experiments that the gels had a cross-linked structure.

Microcrystalline cellulose

Thermogravimetric analysis

Ionic liquid

Gel

Loss modulus

Differential scanning calorimetry

Coagulation agent

Rheology

Storage modulus

Author

Ruth Arino Marine

Chalmers, Materials and Manufacturing Technology, Polymeric Materials and Composites

Malin Brodin

Chalmers, Chemical and Biological Engineering, Organic Chemistry

Antal Boldizar

Chalmers, Materials and Manufacturing Technology, Polymeric Materials and Composites

Gunnar Westman

Chalmers, Chemical and Biological Engineering, Organic Chemistry

BioResources

1930-2126 (ISSN)

Vol. 8 2 2209-2221

Driving Forces

Sustainable development

Subject Categories

Materials Engineering

Chemical Engineering

Areas of Advance

Materials Science

More information

Created

10/8/2017