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Recent Advances in Solvents for the Dissolution, Shaping and Derivatization of Cellulose: Quaternary Ammonium Electrolytes and their Solutions in Water and Molecular Solvents.
University of São Paulo, Brazil.
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.ORCID iD: 0000-0003-2893-8554
Friedrich Schiller University of Jena, Germany.
Friedrich Schiller University of Jena, Germany.
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2018 (English)In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 23, no 3, article id E511Article in journal (Refereed) Published
Abstract [en]

There is a sustained interest in developing solvents for physically dissolving cellulose, i.e., without covalent bond formation. The use of ionic liquids, ILs, has generated much interest because of their structural versatility that results in efficiency as cellulose solvents. Despite some limitations, imidazole-based ILs have received most of the scientific community's attention. The objective of the present review is to show the advantages of using quaternary ammonium electrolytes, QAEs, including salts of super bases, as solvents for cellulose dissolution, shaping, and derivatization, and as a result, increase the interest in further investigation of these important solvents. QAEs share with ILs structural versatility; many are liquids at room temperature or are soluble in water and molecular solvents (MSs), in particular dimethyl sulfoxide. In this review we first give a historical background on the use of QAEs in cellulose chemistry, and then discuss the common, relatively simple strategies for their synthesis. We discuss the mechanism of cellulose dissolution by QAEs, neat or as solutions in MSs and water, with emphasis on the relevance to cellulose dissolution efficiency of the charge and structure of the cation and. We then discuss the use of cellulose solutions in these solvents for its derivatization under homogeneous and heterogeneous conditions. The products of interest are cellulose esters and ethers; our emphasis is on the role of solvent and possible side reactions. The final part is concerned with the use of cellulose dopes in these solvents for its shaping as fibers, a field with potential commercial application.

Place, publisher, year, edition, pages
2018. Vol. 23, no 3, article id E511
Keyword [en]
biomass conversion, cellulose derivatization, cellulose dissolution mechanism, cellulose shaping, molecular solvents, quaternary ammonium electrolytes, super bases
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33394DOI: 10.3390/molecules23030511PubMedID: 29495344OAI: oai:DiVA.org:ri-33394DiVA, id: diva2:1188721
Available from: 2018-03-08 Created: 2018-03-08 Last updated: 2018-03-16Bibliographically approved

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Publisher's full textPubMedhttp://www.mdpi.com/1420-3049/23/3/511

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Jedvert, Kerstin

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