Dissolution enthalpies of cellulose in ionic liquids

Helena Parviainen; Arno Parviainen; Tommi Virtanen; Ilkka Kilpeläinen; Patrik Ahvenainen; Ritva Serimaa; Stina Grönqvist; Thaddeus Maloney; Sirkka Liisa Maunu

doi:10.1016/j.carbpol.2014.07.001

Dissolution enthalpies of cellulose in ionic liquids

Carbohydr Polym. 2014 Nov 26:113:67-76. doi: 10.1016/j.carbpol.2014.07.001. Epub 2014 Jul 9.

Authors

Helena Parviainen¹, Arno Parviainen², Tommi Virtanen¹, Ilkka Kilpeläinen², Patrik Ahvenainen³, Ritva Serimaa³, Stina Grönqvist⁴, Thaddeus Maloney⁵, Sirkka Liisa Maunu⁶

Affiliations

¹ Laboratory of Polymer Chemistry, Department of Chemistry, P.O. Box 55, FI-00014 University of Helsinki, Finland.
² Laboratory of Organic Chemistry, Department of Chemistry, P.O. Box 55, FI-00014 University of Helsinki, Finland.
³ Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 University of Helsinki, Finland.
⁴ VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Espoo, Finland.
⁵ Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, 00076 Aalto, Finland.
⁶ Laboratory of Polymer Chemistry, Department of Chemistry, P.O. Box 55, FI-00014 University of Helsinki, Finland. Electronic address: sirkka.maunu@helsinki.fi.

PMID: 25256460
DOI: 10.1016/j.carbpol.2014.07.001

Abstract

In this work, interactions between cellulose and ionic liquids were studied calorimetrically and by optical microscopy. Two novel ionic liquids (1,5-Diazabicyclo[4.3.0]non-5-enium propionate and N-methyl-1,5-diazabicyclo[4.3.0]non-5-enium dimethyl phosphate) and 1-ethyl-3-methylimidazolium acetate-water mixtures were used as solvents. Optical microscopy served in finding the extent of dissolution and identifying the dissolution pattern of the cellulose sample. Calorimetric studies identified a peak relating to dissolution of cellulose in solvent. The transition did, however, not indicate complete dissolution, but rather dissolution inside fibre or fibrils. This method was used to study differences between four cellulose samples with different pretreatment or origins.

Keywords: Cellulose; Differential scanning calorimetry; Fibre dissolution; Ionic liquid.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Azabicyclo Compounds / chemistry*
Calorimetry
Cellulose / chemistry*
Imidazoles / chemistry*
Ionic Liquids / chemistry*
Microscopy
Solubility
Thermodynamics*

Substances

Azabicyclo Compounds
Imidazoles
Ionic Liquids
Cellulose
1-ethyl-3-methylimidazolium