CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Thermal and viscoelastic properties of cellulosic gels with different ionic liquids and coagulation agents

Ruth Arino (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Malin Brodin (Institutionen för kemi- och bioteknik, Organisk kemi) ; Antal Boldizar (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Gunnar Westman (Institutionen för kemi- och bioteknik, Organisk kemi)
BioResources (1930-2126). Vol. 8 (2013), 2, p. 2209-2221.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Microcrystalline cellulose; Ionic liquid; Coagulation agent; Gel; Rheology; Thermogravimetric analysis; Differential scanning calorimetry; Storage modulus; Loss modulus



Den här publikationen ingår i följande styrkeområden:

Läs mer om Chalmers styrkeområden  

Denna post skapades 2013-03-14. Senast ändrad 2016-02-01.
CPL Pubid: 174673

 

Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Polymera material och kompositer
Institutionen för kemi- och bioteknik, Organisk kemi (2006-2014)

Ämnesområden

Materialvetenskap
Hållbar utveckling
Kemiteknik
Materialteknik

Chalmers infrastruktur