100B-3 |
Preparation of plastic and bio-multilayer films treated with plasma source ion implantation |
G. H. SHIN, Graduate school of biotechnology, Korea Unviversity, 1-5Ka, Anam-dong, Sungbuk-ku, Seoul, 136-701, South Korea and H. J. Park, Graduate school of biotechnology, Korea University, 1-5Ka, Anam-dong, Sungbuk-ku, Seoul, 136-701, South Korea. Most of plastic multilayer films used in food packaging industry contain several thermoplastic films due to the necessity to combine hydrophobic, diffusion barrier and mechanical properties. But, multilayer films have a problem to recycle it. On the other hand, biopolymer films have potential for use with food as oxygen barrier and biodegradable packaging, yet tend to be brittle and moisture sensitive. In order to overcome this problem, plastic and bio-multilayer films were investigated. This films have a good oxygen barrier property and easy recyclability. This study was conducted with the objective of forming plastic and bio-multilayer film which can be recycled easily and have a good oxygen barrier property. Plastic and bio-multilayer films were prepared by spreading chitosan or corn zein solution on a thin-layer chromatography(TLC) plate that was covered LLDPE film. To improve the adhesion between plastic film and biopolymers, plasma source ion implantation (PSII) technique was used. Contact angle meter, XPS, AFM and SEM were used for surface modification analysis. The mechanical properties of the multilayer films were measured by Mocon and Instron. In the case of LLDPE treated with O2-PSII, Oxygen–containing functional groups were formed on the ion implanted polymer surface. As a result of surface modification, adhesion was improved between LLDPE and biopolymer. Tensile strength of multiplayer films were decreased a little compared with LLDPE. However Oxygen permeability of bilayer films coated with chitosan(2.99 fl.m/m2.sec.Pa) or corn zein(0.43 fl.m/m2.sec.Pa) were very lower than LLDPE film (15.77 fl.m/m2.sec.Pa). The Plastic and bio-multilayer films have a potential usefulness for food packaging application because of their oxygen barrier property and easy recyclability of multilayer films.
Session 100B, Food Packaging
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