Technology for Eco-friendly Special Coating Materials for Replacement of Plastics: Preparation and Characterization of Poly(vinyl alcohol)-based Crosslinked Films

초록

After adding cross-linking agents such as maleic acid, succinic acid, and glutaraldehyde to poly(vinyl alcohol) (PVA), cross-linking was performed during drying process to cause water resistance and surface hydrophobization of the resulting film. The formation of cross-linked structure was confirmed through Fourier-transform infrared spectroscopy, and water resistance and surface hydrophobicity were evaluated by swelling degree and water contact angle. As the content of cross-linking agent increased, the swelling degree decreased and the contact angle increased. By adding the crystalline compounds, levan and reduced graphene oxide, hydrophobicity was further improved and PVA's low oxygen permeability was maintained. Consequently, the PVA composite film showed improved water resistance and surface hydrophobicity as well as excellent oxygen barrier properties due to the complementary contributions of the crosslinking agent and crystalline additive. Since almost all the components are inherently biodegradable, the present composite films are expected to be used as eco-friendly functional coatings.

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