Superficial modification in recycled PET by plasma etching for food packaging

Authors

  • S. A. Cruz,

    Corresponding author
    1. Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Rua Santa Adélia 166, CEP 09.210-170, Santo André, Brasil
    • Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Rua Santa Adélia 166, CEP 09.210-170, Santo André, Brasil
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  • M. Zanin,

    1. Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Rod. Washington Luís, Km 235, CEP 13565-905, São Carlos, Brasil
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  • P. A. P. Nascente,

    1. Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Rod. Washington Luís, Km 235, CEP 13565-905, São Carlos, Brasil
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  • M. A. Bica de Moraes

    1. Instituto de Física, Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz, CEP 13083-970, Campinas, Brasil
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Abstract

An oxygen plasma treatment has been used to improve the adhesion of amorphous hydrogenated carbon (a-C:H) films onto surfaces of recycled poly(ethylene terephthalate) (PET). Modifications produced by the oxygen plasma on the PET surface in chemical bonds and morphology were investigated by X-ray photoelectron spectroscopy and atomic force microscopy, respectively. Contact angle measurements were used to study the changes in the surface wettability. Adhesion of the a-C:H film onto the PET surface was investigated by the tape test method. It was observed that the improvement in film adhesion is in good correlation with the increase in surface roughness, due to plasma etching, and with the appearance of oxygen-related functional groups at the surface. The results of this study indicate that a-C:H-coated recycled PET can be used in food packaging. The a-C:H film could be used as a functional barrier to reduce or prevent migration of contaminants from the polymer to the package content. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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