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Influence of the relative amounts of crystalline and amorphous phases on the mechanical properties of polyamide-6 nanocomposites

Authors

  • João Gargalaka Jr.,

    1. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Cidade Universitária, CEP 05508-000, São Paulo, SP, Brazil
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  • Ricardo A. A. Couto,

    1. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Cidade Universitária, CEP 05508-000, São Paulo, SP, Brazil
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  • Vera R. L. Constantino,

    1. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Cidade Universitária, CEP 05508-000, São Paulo, SP, Brazil
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  • Henrique E. Toma,

    1. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Cidade Universitária, CEP 05508-000, São Paulo, SP, Brazil
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  • Koiti Araki

    Corresponding author
    1. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Cidade Universitária, CEP 05508-000, São Paulo, SP, Brazil
    • Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Cidade Universitária, CEP 05508-000, São Paulo, SP, Brazil
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Abstract

The relative amounts of amorphous and crystalline γ- and α-phases in polyamide-6 nanocomposites, estimated from the deconvolution of X-ray diffraction peaks using Gaussian functions, correlates with their mechanical, thermomechanical, and barrier properties. The incorporation of organoclay platelets (Cloisite 15A and 30B) induced the crystallization of the polymer in the γ form at expense of the amorphous phase, such that 1–2 wt % of Cloisite is enough to enhance the mechanical and the thermomechanical properties. However, higher nanofiller loads were necessary to achieve good barrier effects, because this property is mainly dependent on the tortuous path permeation mechanism of the gas molecules through the nanocomposite films. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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