Abstract
The potential of a blended cellulose solvent, consisting of a 1:1 mass ratio of choline chloride with the ionic liquid 1-ethyl-3-methylimadazolium acetate, was evaluated by using a film-casting technique. When comparing films produced with the neat ionic liquid to casting products from the mixed solvent, mechanical properties could largely be retained, while transparency was somewhat impaired. This is attributed to a fibrous microstructure and a higher degree of crystallinity caused by incomplete dissolution of the initial cellulose fibres. The presence of these residual fibres significantly reduced shrinkage during the film formation process. Functional group analyses, together with information on their crystallographic structure, proved that these film-like products should be classified as all-cellulose composites (ACCs). Statistical analyses of tensile properties justify further research on the mixed solvent system for cellulose processing.
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Financial support from PAMSA and the Department of Science and Innovation under Grant No. DST/CON 0004/2019 is gratefully acknowledged. The authors also thank Sappi for supplying of α-cellulose pulp samples as well as equipment to prepare hand sheets.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by HO, EdT, MTL, MA, JWS, SC, and MW. The first draft of the manuscript was written by HO and EdT and final editing was done by WF and EdT. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Oosthuizen, H., du Toit, E.L., Loots, M.T. et al. A novel cost-effective choline chloride/ionic liquid solvent for all-cellulose composite production. Cellulose 30, 127–140 (2023). https://doi.org/10.1007/s10570-022-04907-w
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DOI: https://doi.org/10.1007/s10570-022-04907-w