Properties of blends of linear and branched polypropylenes in film blowing

Authors

  • Yunli Fang,

    1. Center for Applied Research on Polymers and Composites (CREPEC), Chemical Engineering Department, École Polytechnique, P. O. Box 6079, Stn Centre-Ville, Montréal, QC, Canada H3C 3A7
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  • Farhad Sadeghi,

    1. Center for Applied Research on Polymers and Composites (CREPEC), Chemical Engineering Department, École Polytechnique, P. O. Box 6079, Stn Centre-Ville, Montréal, QC, Canada H3C 3A7
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  • Guillaume Fleuret,

    1. Center for Applied Research on Polymers and Composites (CREPEC), Chemical Engineering Department, École Polytechnique, P. O. Box 6079, Stn Centre-Ville, Montréal, QC, Canada H3C 3A7
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  • Pierre J. Carreau

    Corresponding author
    1. Center for Applied Research on Polymers and Composites (CREPEC), Chemical Engineering Department, École Polytechnique, P. O. Box 6079, Stn Centre-Ville, Montréal, QC, Canada H3C 3A7
    • Center for Applied Research on Polymers and Composites (CREPEC), Chemical Engineering Department, École Polytechnique, P. O. Box 6079, Stn Centre-Ville, Montréal, QC, Canada H3C 3A7.
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Abstract

The effect of blending a long-chain branched polypropylene (LCB-PP) with a linear polypropylene (L-PP) on the processability and properties of blown films was investigated. The rheological data revealed that blending an LCB-PP with an L-PP improved the elongational properties and the bubble stability, but a severe drop in the mechanical strength was observed for the blends. The most deteriorating effect was the reduction in the elongation at break in tensile tests carried out in the transverse direction (TD), where no yielding behaviour was observed for the blends.

Abstract

On a étudié l'effet du mélange d'un polypropylène ramifié à chaînes longues (LCB-PP) avec un polypropylène linéaire (L-PP) sur la processabilité et les propriétés des films soufflés. Les données rhéologiques révèlent que le mélange d'un LCB-PP avec un L-PP améliore les propriétés d'élongation et la stabilité des bulles, mais une chute importante de la force mécanique a été observée pour les mélanges. L'effet le plus détériorant est la réduction de l'élongation à la rupture dans les essais de traction dans la direction transverse, où aucun comportement plastique n'a été observé pour les mélanges.

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