Understanding cellulose dissolution： effect of the cation and anion structure of ionic liquids on the solubility of cellulose

The effect of ionic liquids（ILs） on the solubility of cellulose was investigated by changing their anions and cations. The structural variation included 11 kinds of cations in combination with 4 kinds of anions. The interaction between the IL and cellobiose, the repeating unit of cellulose, was clar...

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Bibliographic Details
Published in:Science China. Chemistry 2016-11, Vol.59 (11), p.1421-1429
Main Authors: Zhang, Jinming, Xu, Lili, Yu, Jian, Wu, Jin, Zhang, Xiaoyu, He, Jiasong, Zhang, Jun
Format: Article
Language:English
Subjects:
Anions
Bonding strength
Cations
Cellulose
Chemical bonds
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Dissolution
Hydrogen atoms
Hydrogen bonding
Hydrogen bonds
Ionic liquids
NMR spectroscopy
Oxygen atoms
Solubility
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Summary:The effect of ionic liquids（ILs） on the solubility of cellulose was investigated by changing their anions and cations. The structural variation included 11 kinds of cations in combination with 4 kinds of anions. The interaction between the IL and cellobiose, the repeating unit of cellulose, was clarified through nuclear magnetic resonance（NMR） spectroscopy. The reason for different dissolving capabilities of various ILs was revealed. The hydrogen bonding interaction between the IL and hydroxyl was the major force for cellulose dissolution. Both the anion and cation in the IL formed hydrogen bonds with cellulose. Anions associated with hydrogen atoms of hydroxyls, and cations favored the formation of hydrogen bonds with oxygen atoms of hydroxyls by utilizing activated protons in imidazolium ring. Weakening of either the hydrogen bonding interaction between the anion and cellulose, or that between the cation and cellulose, or both, decreases the capability of ILs to dissolve cellulose.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-016-0269-5