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Citation

Ries, Michael and Lefroy, Katherine and Murray, Brent S. (2022) Data for "The effect of oil on cellulose dissolution in the ionic liquid 1-butyl-3-methyl imidazolium acetate". University of Leeds. [Dataset] https://doi.org/10.5518/1179

Dataset description

Whilst ionic liquids (ILs) are well known to be excellent solvents for cellulose, the exact mechanism of dissolution has been a much-disputed topic in recent years and is still not completely clear. In this work, we add to current understanding and highlight the importance of hydrophobic interactions, through studying cellulose dissolution in mixtures of 1-butyl-3-methyl imidazolium acetate (BmimAc) and medium-chain triglyceride (MCT) oil. We demonstrate that the order in which constituents are mixed together plays a key role, through nuclear magnetic resonance (NMR) spectroscopic analysis. When small quantities of MCT-oil (0.25-1 wt.%) were introduced to BmimAc before cellulose, the effect on BmimAc chemical shift values was much more significant compared to when the cellulose was dissolved first, followed by oil addition. Rheological analysis also showed small differences in the viscosities of oil-cellulose-BmimAc solution viscosities, depending on the order that the constituents were added. On the other hand, no such order effect on the NMR results was observed when cellulose was replaced with cellobiose, suggesting that this observation is unique to the macromolecule. We propose that a cellulose-oil interaction develops, but only when the cellulose structure has a sufficient degree of order and not when the cellulose is molecularly dispersed, since the hydrophobic cellulose plane is no longer intact. In all cases, cellulose-BmimAc-oil solutions were stable for at least 4 months. To our knowledge, this is the first work that investigates the effect of oil addition on the dissolving capacity of BmimAc and highlights the need for further re-evaluation of accepted mechanisms for cellulose dissolution in ILs.

Divisions:	Faculty of Engineering and Physical Sciences > School of Food Science and Nutrition Faculty of Engineering and Physical Sciences > School of Physics and Astronomy
Related resources:	Location Type https://doi.org/10.1021/acsomega.2c04311 Publication https://eprints.whiterose.ac.uk/192007/ Publication
License:	Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited:	30 Sep 2022 14:55
URI:	https://archive.researchdata.leeds.ac.uk/id/eprint/1029
Additional details Additional details Creators or authors: Creators ORCID Other ID Email Primary affiliation Primary affiliation ID Primary affiliation ID type Secondary affiliation Secondary affiliation ID Secondary affiliation ID type Ries, Michael https://orcid.org/0000-0002-8050-3200 University of Leeds https://ror.org/024mrxd33 ror Lefroy, Katherine University of Leeds https://ror.org/024mrxd33 ror Murray, Brent S. https://orcid.org/0000-0002-6493-1547 University of Leeds https://ror.org/024mrxd33 ror Type of data: Dataset Research funders: EPSRC Grant numbers: EP/L015536/1 Publication date: 2022 Resource language: English Metadata language: English Research project title: The effect of oil on cellulose dissolution in the ionic liquid 1-butyl-3-methyl imidazolium acetate Publisher: University of Leeds Contact email: m.e.ries@leeds.ac.uk Last Modified: 03 Sep 2024 10:57

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DATA_FILE_Effect_of_oil_All_Figures.xlsx [259kB] DATA_FILE_Effect_of_oil_All_Figures.xlsx [259kB] DATA_FILE_Effect_of_oil_All_Figures.xlsx [259kB] Security: Anyone File name: DATA_FILE_Effect_of_oil_All_Figures.xlsx Content type: Data Mime-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet License: Creative Commons Attribution 4.0 International (CC BY 4.0) File size: 259kB