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Dissolution state of cellulose in aqueous systems. 1. Alkaline solvents
Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal..
Univ Algarve, Fac Sci & Technol MEDITBIO, Campus Gambelas,Ed 8, P-8005139 Faro, Portugal..
Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal..
Lund Univ, Ctr Chem & Chem Engn, Dept Chem, Div Phys Chem, S-22100 Lund, Sweden..
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2016 (Engelska)Ingår i: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 23, nr 1, s. 247-258Artikel i tidskrift (Refereegranskat) Published
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Abstract [en]

The understanding of the state of dissolution of cellulose in a certain solvent is a critical step forward in the development of new efficient solvent systems for cellulose. Nevertheless, obtaining such information is not trivial. Recently, polarization transfer solid-state NMR (PTssNMR) was shown to be a very promising technique regarding an efficient and robust characterization of the solution state of cellulose. In the present study, combining PTssNMR, microscopic techniques and X-ray diffraction, a set of alkaline aqueous systems are investigated. The addition of specific additives, such as urea or thiourea, to aqueous NaOH based systems as well as the use of an amphiphilic organic cation, is found to have pronounced effects on the dissolution efficiency of cellulose. Additionally, the characteristics of the regenerated material are strongly dependent on the dissolution system; typically less crystalline materials, presenting smoother morphologies, are obtained when amphiphilic solvents or additives are used.

Ort, förlag, år, upplaga, sidor
2016. Vol. 23, nr 1, s. 247-258
Nyckelord [en]
Amphiphilicity, Chain packing, PTssNMR, NaOH, TBAH
Nationell ämneskategori
Kemiteknik
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URN: urn:nbn:se:miun:diva-27243DOI: 10.1007/s10570-015-0809-6ISI: 000368802700014Scopus ID: 2-s2.0-84955678486OAI: oai:DiVA.org:miun-27243DiVA, id: diva2:913462
Tillgänglig från: 2016-03-21 Skapad: 2016-03-17 Senast uppdaterad: 2017-11-30Bibliografiskt granskad

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