Morphology, optical transparency and oxygen barrier of EVOH/graphene oxide films
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2016
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BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 3rd
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Food packaging materials require high gas and moisture barrier in other to preserve the quality of the products during storage and handling. Polyolefin materials have been widely used due to their water vapor resistance. Ethylene–vinyl alcohol copolymer (EVOH) is used as a gas barrier layer in packaging products that require high gas barrier. However, EVOH is very sensitive to moisture and its gas barrier ability deteriorates in high relative humidity conditions. In order to overcome the adverse effects of moisture on EVOH film this paper studies the incorporation of small amount of graphene oxide in EVOH by melt processing and evaluates their effects on morphology, optical transparency and oxygen barrier of EVOH film. The EVOH/Graphene oxide (EVOH/GO) film were processed by twin-screw extrusion and extrusion blown film processing. The films was characterized by XRD, FEG-SEM, and UV/VIS analysis. In addition, the oxygen transmission rate (OTR) were performed at 23 C, 0 % and 90 % relative humidity using an OX-TRAN (MOCON Inc.). According to the results of the optical transparency measured, the EVOH/GO retaining good transparency films for all graphene oxide percentage added. The graphene oxide at only 0.1 wt. % into the EVOH matrix drastically improved the oxygen barrier properties of EVOH/GO flexible film in both, 0 % and 90 % of the relative humidity test conditions.
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ORTIZ, ANGEL; AKBULUT, MESHUDE; SANTANA, JULYANA G.; RANGARI, VIJAY K.; VALENZUELA-DIAZ, FRANCISCO; GUVEN, OLGUN; MOURA, ESPERIDIANA. Morphology, optical transparency and oxygen barrier of EVOH/graphene oxide films. In: BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 3rd, August 28-31, 2016, Gramado, RS. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/26740. Acesso em: 26 Apr 2024.
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