Fast and highly efficient acetylation of xylans in ionic liquid systems
Journal article, 2013

In this study high molecular weight pure rye arabinoxylan and spruce arabinoglucuronoxylan were acetylated in ionic liquid (IL) systems. Two different ILs were used in our study. In both IL, using optimized procedures, it was possible to achieve acetylation within 5 min. The first system involved direct dissolution into 1-ethyl-3-methylimidazolium dimethylphosphate ([emim][Me2PO4]), followed by addition of acetyl chloride/pyridine (AcCl/Pyr) and additional chloroform (CHCl3), as co-solvent. The other system involved direct dissolution into the novel protic IL 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]), followed by acetic anhydride/1,5-diazabicyclo[4.3.0]non-5-ene (Ac2O/DBN) and no co-solvent added. The full acetyl substitution of the xylans was confirmed by FT IR and H-1 NMR. The acetylated xylans maintained a high molecular weight, which was confirmed by gel permeation chromatography. The products were soluble in CHCl3 and dimethyl carbonate, which is considered as a 'green' reagent or solvent. This allowed for the casting of the materials into clear transparent films, opening opportunity for further processing and evaluation of these materials.

arabinoxylans

Xylan

wood

solvents

derivatives

dissolution

nmr

Ionic liquid

anhydride

wheat-straw hemicelluloses

cellulose

Rye

Acetylation

oxygen barrier films

Spruce

Author

Agnes Stépán

Chalmers, Chemical and Biological Engineering, Polymer Technology

A. W. T. King

University of Helsinki

T. Kakko

University of Helsinki

Guillermo Toriz Gonzalez

Chalmers, Chemical and Biological Engineering, Polymer Technology

I. Kilpelainen

University of Helsinki

Paul Gatenholm

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemical and Biological Engineering, Polymer Technology

Cellulose

0969-0239 (ISSN)

Vol. 20 6 2813-2824

Subject Categories

Paper, Pulp and Fiber Technology

Textile, Rubber and Polymeric Materials

DOI

10.1007/s10570-013-0028-y

More information

Latest update

8/24/2018