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    Exploring the rearrangement of amorphous cellulose model thin films upon heat treatment

    Year: 2012

    Journal: Soft Matter, 2012,8, 9807-9815, 20130118

    Authors: Tamil Mohana ‡, Stefan Spirka * ‡, Rupert Kargl b ‡, Aleš Doliška a ‡, Alenka Vesel c, Ingo Salzmann d, Roland Resel e, Volker Ribitsch b‡, Karin Stana-Kleinschek a ‡

    Last authors: Karin Stana-Kleinscheka

    Organizations: a Faculty of Mechanical Engineering, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia. b Karl-Franzens-Universität Graz, Institut für Chemie, Heinrichstraße 28/III, 8010 Graz, Austria. c Jožef Stefan Institute, Ljubljana, Jamova 39, SI-1001 Ljubljana, Slovenia d Humboldt Universität zu Berlin, Institut für Physik, Unter den Linden 6, 10099 Berlin, Germany. e University of Technology Graz, Institute of Solid State Physics, Petersgasse 16, 8010 Graz, Austria. ‡ Members of the European Polysaccharide Network of Excellence

    Country: Austria, Slovenia, Germany

    The behavior of amorphous cellulose model thin films upon heat treatment is investigated. Upon heat treatment, a structural rearrangement in the films from a featureless to a fibrillar structure is observed which correlates with the regeneration time and total cellulose content as proven by atomic force microscopy and X-ray photoelectron spectroscopy. ATR-IR spectroscopy proves the presence of stronger hydrogen bonds in the heat treated surfaces which originate from a reorganization of the cellulose chains and pore structure. The rearrangement is accompanied with an increased surface hydrophobicity, a reduced swelling capacity and a reduction in the water content of the films. An increase in crystallinity of the films is not observed.