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Rheological behavior and mechanical properties of sawdust/polyethylene composites

Authors

  • F. Godard,

    1. Département en Sciences Appliquées, Université du Québec en Abitibi-Témiscamingue, 445 Boulevard de l'Université, Rouyn-Noranda, QC, Canada, J9X 5E4
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  • M. Vincent,

    1. Mines ParisTech, CEMEF (Centre de Mise en Forme des Matériaux), UMR CNRS 7635, BP 207, 06904 Sophia-Antipolis Cedex, France
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  • J.-F. Agassant,

    1. Mines ParisTech, CEMEF (Centre de Mise en Forme des Matériaux), UMR CNRS 7635, BP 207, 06904 Sophia-Antipolis Cedex, France
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  • B. Vergnes

    Corresponding author
    1. Mines ParisTech, CEMEF (Centre de Mise en Forme des Matériaux), UMR CNRS 7635, BP 207, 06904 Sophia-Antipolis Cedex, France
    • Mines ParisTech, CEMEF (Centre de Mise en Forme des Matériaux), UMR CNRS 7635, BP 207, 06904 Sophia-Antipolis Cedex, France
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Abstract

We have characterized the melt rheological behavior and the solid tensile properties of sawdust/polyethylene composites prepared in an internal mixer. Various concentrations (from 0 to 60 wt %) and three particle sizes have been tested, in presence of a coupling agent (maleic anhydride grafted polyethylene). In the molten state, for each particle size, a mastercurve of the complex viscosity as function of frequency can be plotted, using a shift factor depending on weight fraction. We show that the shift factors can be described by a Krieger-Dougherty law, leading to a “universal” viscosity law of the Carreau-Yasuda type. In the solid state, the presence of sawdust increases Young modulus in uniaxial elongation, mainly for small size particles, but reduces dramatically deformation at break and tensile strength. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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