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Micromechanics of TEMPO-oxidized fibrillated cellulose composites
Department of Forest Products Technology, School of Chemical Technology, Aalto University.
Materials Science Centre, School of Materials, School of Materials, University of Manchester.
Department of Forest Products Technology, School of Chemical Technology, Aalto University.
College of Engineering, Mathematics and Physical Sciences, University of Exeter.
2012 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 4, no 1, 331-337 p.Article in journal (Refereed) Published
Abstract [en]

Composites of poly(lactic) acid (PLA) reinforced with TEMPO-oxidized fibrillated cellulose (TOFC) were prepared to 15, 20, 25, and 30% fiber weight fractions. To aid dispersion and to improve stress transfer, we acetylated the TOFC prior to the fabrication of TOFC-PLA composite films. Raman spectroscopy was employed to study the deformation micromechanics in these systems. Microtensile specimens were prepared from the films and deformed in tension with Raman spectra being collected simultaneously during deformation. A shift in a Raman peak initially located at ∼1095 cm -1, assigned to C-O-C stretching of the cellulose backbone, was observed upon deformation, indicating stress transfer from the matrix to the TOFC reinforcement. The highest band shift rate, with respect to strain, was observed in composites having a 30% weight fraction of TOFC. These composites also displayed a significantly higher strain to failure compared to pure acetylated TOFC film, and to the composites having lower weight fractions of TOFC. The stress-transfer processes that occur in microfibrillated cellulose composites are discussed with reference to the micromechanical data presented. It is shown that these TOFC-based composite materials are progressively dominated by the mechanics of the networks, and a shear-lag type stress transfer between fibers.

Place, publisher, year, edition, pages
2012. Vol. 4, no 1, 331-337 p.
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-65743DOI: 10.1021/am201399qScopus ID: 2-s2.0-84856261365OAI: oai:DiVA.org:ltu-65743DiVA: diva2:1142812
Available from: 2017-09-20 Created: 2017-09-20 Last updated: 2017-11-24Bibliographically approved

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