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Influence of water on the intrinsic characteristics of cellulose dissolved in an ionic liquid

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Abstract

The local structure of cellulose, dissolved in the frequently used ionic liquid EMIm-OAc, is modelled by a coaxial double layer cylinder. The cylinder’s core consists of a cellulose chain while the sheath is formed by a solvent layer with lower electron density than the bulk solvent. We studied 2% cellulose solutions in EMIm-OAc and their behavior upon addition of increasing amounts of water. At this cellulose concentration, 15 wt% of water induced the precipitation of cellulose. Water molecules did not form an independent phase, but were bound to EMIm-OAc in the cellulose/water/EMIm-OAc solution. The conformational of a cellulose chain changes by adding water into the solution, and the square of the apparent cross-sectional radius of gyration of the cellulose chain becomes zero to negative. This phenomenon is explained by the formation of a solvation shell with lower electron density than the bulk solvent around the cellulose chain.

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Acknowledgments

This work was performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2014G604 and 2015G147). This work was financially supported by the Center for Fiber Textile Science in Kyoto Institute of Technology, and the Astrian Biorefinery Center Tulln (ABCT). We gratefully acknowledge and the work of past and present members of our laboratories involved in the work.

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Authors and Affiliations

  1. Division of Chemistry of Renewables, Department of Chemistry, University of Natural Resources and Life Sciences, Vienna (BOKU), Muthgasse 18, 1190, Vienna, Austria

    Mitsuharu Koide & Thomas Rosenau

  2. Department of Biobased Materials Science, Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto City, Kyoto, 6068585, Japan

    Hiroshi Urakawa & Isao Wataoka

  3. Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda City, Nagano, 3868567, Japan

    Kanji Kajiwara

  4. Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Porthansgatan 3, 20500, Turku, Finland

    Thomas Rosenau

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  1. Mitsuharu Koide
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  2. Hiroshi Urakawa
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  3. Kanji Kajiwara
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  4. Thomas Rosenau
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  5. Isao Wataoka
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Correspondence to Isao Wataoka.

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Koide, M., Urakawa, H., Kajiwara, K. et al. Influence of water on the intrinsic characteristics of cellulose dissolved in an ionic liquid. Cellulose 27, 7389–7398 (2020). https://doi.org/10.1007/s10570-020-03323-2

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  • DOI: https://doi.org/10.1007/s10570-020-03323-2

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