Polipropileno clarificado recoberto com filme de carbono amorfo hidrogenado pelo processo PECVD / Clarified polypropylene coated with hydrogenated amorphous carbon film by PECVD process

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

03/10/2011

RESUMO

This work aimed to study the feasibility of application of clarified polypropylene (cPP) coated with hydrogenated amorphous carbon films (a-C:H) deposited by Plasma Enhanced Chemical Vapour Deposition (PECVD) in food packaging, mainly targeting the segment of bottles for carbonated beverages. For the deposition of films of a-C:H using different deposition parameters in order to produce films with Diamond Like Carbon (DLC) and Polymer Like Carbon structures. (PLC). After deposition, the films were chemically characterized by the technique of reflection-absorption spectroscopy in the infrared area (IRRAS) and spectroscopy in the Raman region. In order to improve adhesion of polymeric films to the substrate surface, some modification was performed at the cPP by a treatment with oxygen plasma. cPP samples coated with different types of amorphous carbon films were subjected to an accelerated aging test with immersion in liquid food simulants, as specified by the Food and Drug Administration (FDA), to simulate shelf-life packaging and behavior of the film when in contact with liquid simulants. Before and after the accelerated aging test, the samples were evaluated for their adherence by scanning electron microscopy (SEM) and test tape. The surface modification of the substrate by oxygen plasma proved to be an efficient method of increasing the adhesion of film a-C:H in the polymer. The modified surface was analyzed by atomic force microscopy (AFM), contact angle and infrared absorption spectroscopy (FT-IR). Finally, to evaluate which structure promoted a greater reduction in permeability of the polymer, the test was conducted to water vapor permeation, with results showing that the films of aC: H were effective in increasing the barrier of cPP, coming to values of approximately 85% reduction in permeability

ASSUNTO(S)

engenharia de materiais e metalurgica polipropileno clarificado filme de a-c:h plasma embalagens agente clarificante polypropylene clarified film a-c:h plasma packing clarifying agent

ACESSO AO ARTIGO

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