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    Université de Fribourg

    Stress transfer in cellulose nanowhisker composites—Influence of whisker aspect ratio and surface charge

    Rusli, Rafeadah ; Shanmuganathan, Kadhiravan ; Rowan, Stuart J. ; Weder, Christoph ; Eichhorn, Stephen J.

    In: Biomacromolecules, 2011, vol. 12, no. 4, p. 1363–1369

    The mechanically induced molecular deformation of cellulose nanowhiskers embedded in subpercolation concentration in an epoxy resin matrix was monitored through Raman spectroscopy. Cellulose nanowhiskers isolated by sulfuric acid hydrolysis from tunicates and by sulfuric acid hydrolysis and hydrochloric acid hydrolysis from cotton were used to study how the aspect ratio (ca. 76 for tunicate and...

    Université de Fribourg

    Bioinspired mechanically adaptive polymer nanocomposites with water-activated shape-memory effect

    Mendez, Julie ; Annamalai, Pratheep K. ; Eichhorn, Stephen J. ; Rusli, Rafeadah ; Rowan, Stuart J. ; Foster, E. Johan ; Weder, Christoph

    In: Macromolecules, 2011, vol. 44, no. 17, p. 6827–6835

    New biomimetic, stimuli-responsive mechanically adaptive nanocomposites, which change their mechanical properties upon exposure to water and display a water-activated shape-memory effect, were investigated. These materials were produced by introducing rigid cotton cellulose nanowhiskers (CNWs) into a rubbery polyurethane (PU) matrix. A series of materials with CNW concentrations of 2–20% v/v...

    Université de Fribourg

    Stress-transfer in anisotropic and environmentally adaptive cellulose whisker nanocomposites

    Rusli, Rafeadah ; Shanmuganathan, Kadhiravan ; Rowan, Stuart J. ; Weder, Christoph ; Eichhorn, Stephen J.

    In: Biomacromolecules, 2010, vol. 11, no. 3, p. 762–768

    Quantitative insights into the stress-transfer mechanisms that determine the mechanical properties of tunicate cellulose whisker/poly(vinyl acetate) nanocomposites were gained by Raman spectroscopy. The extent of stress-transfer is influenced by local orientation (or anisotropy) of the whiskers, which in turn is governed by the processing conditions used to fabricate the nanocomposites....