Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1088, Issue -, Pages 101-104Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2015.02.031
Keywords
Cellulose; Dissolution mechanism; [C(4)mim][CH3COO]/DMSO solvent; C-13 NMR spectra
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Funding
- National Natural Science Foundation of China [21373078]
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Recently, it has been reported that 1-butyl-3-methylimidazolium acetate/dimethyl sulfoxide ([C(4)mim] [CH3COO]/DMSO) can efficiently dissolve cellulose at room temperature. In the present study, C-13 NMR measurements of 1-butyl-3-methylimidazolium acetate [C(4)mim][CH3COO] and cellulose were carried out in [C(4)mim][CH3COO]/DMSO-d(6) (Deuterated dimethyl sulfoxide)/cellulose solution to directly reveal the possible dissolution mechanism of cellulose in true [C(4)mim][CH3COO]/DMSO solvent. The results indicate that both cation and anion of [C(4)mim][CH3COO] in [C(4)mim][CH3COO]/DMSO solvent dominate cellulose dissolution, and DMSO mainly serves to dissociate the ion pairs in [C(4)mim][CH3COO] into solvated cations and anions. Moreover, the hydrogen bonding interaction of anion of [C(4)mim][CH3COO] with cellulose hydroxyl proton is much stronger than that of cation of [C(4)mim][CH3COO] with cellulose hydroxyl oxygen. (C) 2015 Published by Elsevier B.V.
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