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http://dx.doi.org/10.5012/bkcs.2013.34.12.3771

Imidazolium Chloride-LiCl Melts as Efficient Solvents for Cellulose  

Agarwal, Shalu (Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University)
Hossain, Anwar Md. (Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University)
Choi, Young-Seop (Department of Chemistry, Korea University)
Cheong, Minserk (Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University)
Jang, Ho Gyeom (Department of Chemistry, Korea University)
Lee, Je Seung (Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University)
Publication Information
Bulletin of the Korean Chemical Society / v.34, no.12, 2013 , pp. 3771-3776 More about this Journal
Abstract
1-Alkyl-3-methylimidazolium chloride-LiCl melts were prepared from the reaction of 1-alkyl-3-methylimidazolium chloride ([RMIm]Cl; R=allyl or n-butyl) and lithium chloride, and their ability to dissolve cellulose was evaluated. The solubility of cellulose was greatly increased to 320% when [RMIm]Cl was replaced by [RMIm][$LiCl_2$]. Dissolved cellulose in LiCl/[RMIm]Cl melts was successfully regenerated by adding water and LiCl/[RMIm]Cl melts were easily recovered by removing water. As supported by the computational results, the higher solubility of cellulose in [RMIm][$LiCl_2$] can be ascribed to the increased bond distance between anion and C(2)-H of the imidazolium ring compared with that in [RMIm]Cl, thereby resulting in the increased interaction between $[LiCl_2]^-$ and the hydroxyl groups of cellulose.
Keywords
Cellulose; Dissolution; Ionic liquid; Lithium chloride; Dihedral angle;
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