Improvement of polycarbonate properties by coating of TiO2 and SiO2 thin film

초록

The property improvement of polycarbonate coated with a multilayer film composed of an inorganic SiO₂ film and a photocatalytic TiO₂ film was studied. The SiO₂ film as a binder had an excellent light transmission characteristic. After the treatment with atmospheric pressure plasma, the surface of SiO₂ film showed the hydrophilicity, which increased the film coating uniformity with a TiO₂-containing aqueous solution. When TiO₂ film was over 200 nm thick, the absorption effect of UV rays in the range of 180~400 nm suppressed the yellowing phenomena of polycarbonate substrate. The inorganic film improved the heat resistance of polycarbonate substrates. TiO₂ film in the outmost under the exposure of UV rays promotes the catalytic oxidation characteristics and yields the capability to the decomposition of organic contaminants, and also increases the self-cleaning properties due to the increase of hydrophilicity. Structural stability of the polycarbonate substrate coated with inorganic TiO₂ and SiO₂ film was shown. The role of SiO₂ film between TiO₂ and polycarbonate substrate suppressed the peeling of TiO₂ film by inhibiting the photocatalytic oxidation effect of TiO₂ film on the polycarbonate substrate. © 2014 The Korean Society of Industrial and Engineering Chemistry. All rights reserved.

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