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http://dx.doi.org/10.14478/ace.2013.1095

Improvement of Polycarbonate Properties by Coating of TiO2 and SiO2 Thin Film  

Won, Dong So (Department of Chemical Engineering, Kangwon National University)
Lee, Won Gyu (Department of Chemical Engineering, Kangwon National University)
Publication Information
Applied Chemistry for Engineering / v.25, no.1, 2014 , pp. 41-46 More about this Journal
Abstract
The property improvement of polycarbonate coated with a multilayer film composed of an inorganic $SiO_2$ film and a photocatalytic $TiO_2$ film was studied. The $SiO_2$ film as a binder had an excellent light transmission characteristic. After the treatment with atmospheric pressure plasma, the surface of $SiO_2$ film showed the hydrophilicity, which increased the film coating uniformity with a $TiO_2$-containing aqueous solution. When $TiO_2$ 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. $TiO_2$ 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 $TiO_2$ and $SiO_2$ film was shown. The role of $SiO_2$ film between $TiO_2$ and polycarbonate substrate suppressed the peeling of $TiO_2$ film by inhibiting the photocatalytic oxidation effect of $TiO_2$ film on the polycarbonate substrate.
Keywords
polycarbonate; $TiO_2$; $SiO_2$; transmittance; surface property;
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