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 SiO<inf>2</inf> film and a photocatalytic TiO<inf>2</inf> film was studied. The SiO<inf>2</inf> film as a binder had an excellent light transmission characteristic. After the treatment with atmospheric pressure plasma, the surface of SiO<inf>2</inf> film showed the hydrophilicity, which increased the film coating uniformity with a TiO<inf>2</inf>-containing aqueous solution. When TiO<inf>2</inf> 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. TiO<inf>2</inf> 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 TiO<inf>2</inf> and SiO<inf>2</inf> film was shown. The role of SiO<inf>2</inf> film between TiO<inf>2</inf> and polycarbonate substrate suppressed the peeling of TiO<inf>2</inf> film by inhibiting the photocatalytic oxidation effect of TiO<inf>2</inf> film on the polycarbonate substrate. © 2014 The Korean Society of Industrial and Engineering Chemistry. All rights reserved.

키워드