Thermal and viscoelastic properties of cellulosic gels with different ionic liquids and coagulation agents
Artikel i vetenskaplig tidskrift, 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

Författare

Ruth Arino Marine

Chalmers, Material- och tillverkningsteknik, Polymera material och kompositer

Malin Brodin

Chalmers, Kemi- och bioteknik, Organisk kemi

Antal Boldizar

Chalmers, Material- och tillverkningsteknik, Polymera material och kompositer

Gunnar Westman

Chalmers, Kemi- och bioteknik, Organisk kemi

BioResources

1930-2126 (ISSN)

Vol. 8 2 2209-2221

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Kemiteknik

Styrkeområden

Materialvetenskap

Mer information

Skapat

2017-10-08