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Highly ductile fibres and sheets by core-shell structuring of the cellulose nanofibrils
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Fiberteknologi. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellens Centrum BiMaC Innovation.ORCID-id: 0000-0002-7410-0333
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Biokompositer. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellens Centrum BiMaC Innovation. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0001-5818-2378
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Fiberteknologi. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellens Centrum BiMaC Innovation. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0001-8622-0386
2014 (engelsk)Inngår i: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 21, nr 1, s. 323-333Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2014. Vol. 21, nr 1, s. 323-333
Emneord [en]
Borohydride reduction, Dialcohol cellulose, Ductile paper, Energy absorption, Periodate oxidation, Strain at break, Core-shell structure
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Identifikatorer
URN: urn:nbn:se:kth:diva-142496DOI: 10.1007/s10570-013-0099-9ISI: 000330807000024Scopus ID: 2-s2.0-84893695071OAI: oai:DiVA.org:kth-142496DiVA, id: diva2:703270
Forskningsfinansiär
Vinnova
Merknad

QC 20140306

Tilgjengelig fra: 2014-03-06 Laget: 2014-03-06 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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

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