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Highly ductile fibres and sheets by core-shell structuring of the cellulose nanofibrils
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.ORCID iD: 0000-0002-7410-0333
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Biocomposites. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-5818-2378
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-8622-0386
2014 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 21, no 1, 323-333 p.Article in journal (Refereed) Published
Abstract [en]

A greater ductility of cellulosic materials is important if they are to be used in increasingly advanced applications. This study explores the potential for using chemical core-shell structuring on the nanofibril level to alter the mechanical properties of cellulose fibres and sheets made thereof. The structuring was achieved by a selective oxidation of the cellulose C2-C3 bonds with sodium periodate, followed by a reduction of the aldehydes formed with sodium borohydride, i.e. locally transforming cellulose to dialcohol cellulose. The resulting fibres were morphologically characterised and the sheets made of these modified fibres were mechanically tested. These analyses showed a minor decrease in the degree of polymerisation, a significantly reduced cellulose crystal width and a greater ductility. At 27 % conversion of the available C2-C3 bonds, sheets could be strained 11 %, having a stress at break of about 90 MPa, and consequently a remarkable tensile energy absorption at rupture of about 9 kJ/kg, i.e. 3-4 times higher than a strong conventional paper. Zero-span tensile measurements indicated that the treatment increased the ductility not only of sheets but also of individual fibres. This suggests that the amorphous and molecularly more mobile dialcohol cellulose is located as a shell surrounding the crystalline core of the cellulose fibrils, and that, at deformations beyond the yield point, this facilitates plastic deformation both within and between individual fibres.

Place, publisher, year, edition, pages
2014. Vol. 21, no 1, 323-333 p.
Keyword [en]
Borohydride reduction, Dialcohol cellulose, Ductile paper, Energy absorption, Periodate oxidation, Strain at break, Core-shell structure
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-142496DOI: 10.1007/s10570-013-0099-9ISI: 000330807000024Scopus ID: 2-s2.0-84893695071OAI: oai:DiVA.org:kth-142496DiVA: diva2:703270
Funder
Vinnova
Note

QC 20140306

Available from: 2014-03-06 Created: 2014-03-06 Last updated: 2017-12-05Bibliographically approved

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Larsson, Per A.Berglund, Lars A.Wågberg, Lars

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Fibre TechnologyVinnExcellence Center BiMaC InnovationBiocompositesWallenberg Wood Science Center
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