Biomimetic polysaccharide nanocomposites of high cellulose content and high toughness
2007 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 8, no 8, 2556-2563 p.Article in journal (Refereed) Published
Plant cell walls combine mechanical stiffness, strength and toughness despite a highly hydrated state. Inspired by this, a nanostructured cellulose network is combined with an almost viscous polysaccharide matrix in the form of a 50/50 amylopectin-glycerol blend. Homogeneous films with a microfibrillated cellulose (MFC) nanofiber content in the range of 10-70 wt % are successfully cast. Characterization is carried out by dynamic mechanical analysis, field-emission scanning electron microscopy, X-ray diffraction, and mercury density measurements. The MFC is well dispersed and predominantly oriented random-in-the-plane. High tensile strength is combined with high modulus and very high work of fracture in the nanocomposite with 70 wt % WC. The reasons for this interesting combination of properties include nanofiber and matrix properties, favorable nanofiber-matrix interaction, good dispersion, and the ability of the MFC network to maintain its integrity to a strain of at least 8%.
Place, publisher, year, edition, pages
2007. Vol. 8, no 8, 2556-2563 p.
Biomimetics, Cellulose, Field emission microscopes, Polysaccharides, Scanning electron microscopy, Stiffness, Tensile strength, Toughness, X ray diffraction analysis
IdentifiersURN: urn:nbn:se:kth:diva-6717DOI: 10.1021/bm0703160ISI: 000248755000029PubMedID: 17655354ScopusID: 2-s2.0-34548253109OAI: oai:DiVA.org:kth-6717DiVA: diva2:11505
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Tidigare titel: Biomimetic polysaccharide nanocomposites of high cellulose content.
QC 201011182007-01-102007-01-102011-09-05Bibliographically approved