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On the dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide: a frustrated solvent
RISE - Research Institutes of Sweden, Material och produktion, IVF.ORCID-id: 0000-0003-4765-8224
Lund University, Sweden.
Lund University, Sweden.
RISE - Research Institutes of Sweden, Material och produktion, IVF.ORCID-id: 0000-0002-5212-780x
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2017 (Engelska)Ingår i: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 24, nr 9, s. 3645-3657Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We have found that the dissolution of cellulose in the binary mixed solvent tetrabutylammonium acetate/dimethyl sulfoxide follows a previously overlooked near-stoichiometric relationship such that one dissolved acetate ion is able to dissolve an amount of cellulose corresponding to about one glucose residue. The structure and dynamics of the resulting cellulose solutions were investigated using small-angle X-ray scattering (SAXS) and nuclear magnetic resonance techniques as well as molecular dynamics simulation. This yielded a detailed picture of the dissolution mechanism in which acetate ions form hydrogen bonds to cellulose and causes a diffuse solvation sheath of bulky tetrabutylammonium counterions to form. In turn, this leads to a steric repulsion that helps to keep the cellulose chains apart. Structural similarities to previously investigated cellulose solutions in aqueous tetrabutylammonium hydroxide were revealed by SAXS measurement. To what extent this corresponds to similarities in dissolution mechanism is discussed.

Ort, förlag, år, upplaga, sidor
2017. Vol. 24, nr 9, s. 3645-3657
Nyckelord [en]
Cellulose dissolution, Ionic liquids, Nuclear magnetic resonance, Small angle X-ray scattering, Molecular dynamics simulations
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-30144DOI: 10.1007/s10570-017-1370-2Scopus ID: 2-s2.0-85021162537OAI: oai:DiVA.org:ri-30144DiVA, id: diva2:1128911
Tillgänglig från: 2017-07-31 Skapad: 2017-07-31 Senast uppdaterad: 2019-06-28Bibliografiskt granskad

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Idström, AlexanderOlsson, CarinaKöhnke, Tobias

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