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Switchable ionic liquids enable efficient nanofibrillation of wood pulp
Umeå University, Faculty of Science and Technology, Department of Chemistry. Laboratory of Industrial Chemistry and Reaction Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Turku, Finland.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2017 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 24, no 8, 3265-3279 p.Article in journal (Refereed) Published
Abstract [en]

Use of switchable ionic liquid (SIL) pulp offers an efficient and greener technology to produce nanofibers via ultrafine grinding. In this study, we demonstrate that SIL pulp opens up a mechanically efficient route to the nanofibrillation of wood pulp, thus providing both a low cost and chemically benign route to the production of cellulose nanofibers. The degree of fibrillation during the process was evaluated by viscosity and optical microscopy of SIL treated, bleached SIL treated and a reference pulp. Furthermore, films were prepared from the fibrillated material for characterization and tensile testing. It was observed that substantially improved mechanical properties were attained as a result of the grinding process, thus signifying nanofibrillation. Both SIL treated and bleached SIL treated pulps were fibrillated into nanofibers with fiber diameters below 15 nm thus forming networks of hydrophilic nature with an intact crystalline structure. Notably, it was found that the SIL pulp could be fibrillated more efficiently than traditional pulp since nanofibers could be produced with more than 30% less energy when compared to the reference pulp. Additionally, bleaching reduced the energy demand by further 16%. The study demonstrated that this switchable ionic liquid treatment has considerable potential in the commercial production of nanofibers due to the increased efficiency in fibrillation.

Place, publisher, year, edition, pages
2017. Vol. 24, no 8, 3265-3279 p.
Keyword [en]
Switchable ionic liquids (SIL), Efficient fibrillation, Wood pulp, Cellulose nanofiber, Ultrafine grinding
National Category
Paper, Pulp and Fiber Technology Chemical Process Engineering
Identifiers
URN: urn:nbn:se:umu:diva-137721DOI: 10.1007/s10570-017-1354-2ISI: 000405612000013OAI: oai:DiVA.org:umu-137721DiVA: diva2:1120801
Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-11-13Bibliographically approved

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Anugwom, IkennaHedenström, MattiasMikkola, Jyri-Pekka
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Paper, Pulp and Fiber TechnologyChemical Process Engineering

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