Mechanical and rheological properties of the maleated polypropylene–layered silicate nanocomposites with different morphology

Authors

  • Chong Min Koo,

    1. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon 305-701, South Korea
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  • Mi Jung Kim,

    1. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon 305-701, South Korea
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  • Min Ho Choi,

    1. Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853
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  • Sang Ouk Kim,

    1. Department of Chemical Engineering, University of Wisconsin at Madison, 2020 Engineering Hall, 1415 Engineering Drive, Madison, Wisconsin 53706
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  • In Jae Chung

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon 305-701, South Korea
    • Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon 305-701, South Korea
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Abstract

Three types of maleated polypropylene–layered silicate nanocomposites with different dispersion states of layered silicate (deintercalated, intercalated, and exfoliated states) are prepared from two kinds of polypropylenes with different molecular weights, organically modified layered silicate and pristine montmorillonite to investigate the effect of the final morphology of the nanocomposite on the rheological and mechanical properties. Maleated polypropylene with high molecular weight intercalates slowly and the other with low molecular weight exfoliates fast into the organophilic layered silicates. Rheological properties such as oscillatory storage modulus, nonterminal behavior, and relative viscosity has close relationship with the dispersion state of layered silicates. The exfoliated nanocomposite shows the largest increase and the deintercalated nanocomposite shows almost no change in relative shear and complex viscosities with the clay content. The exfoliated nanocomposite shows the largest drop in complex viscosity due to shear alignment of clay layers in the shear flow. In addition, the final dispersion state of layered silicates intimately relates to the mechanical property. The dynamic storage moduli of nanocomposites show the same behavior as the relative shear and complex viscosities. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1526–1535, 2003

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