Preparation And Property Studies Of Organic-Inorganic Hybrid Coatings With ZrO₂/TiO₂

The disadvantages of the optical plastics have restrained their utilities in far higher level. While trying to redesign the structure of plastics to improve their properties, people have paid much more attention to surface-treating. In order to improve their marresistance, variety of kinds of methods in which abrasion-resistant coating is effective and convenient have been devised. In this thesis, we fabricated high refractive index organic-inorganic hybrid films through sol-gel process.In chapter Two, we use titanium butoxide as raw material, and co-hydrolysis with silicon coupling agent to prepare hybrid films. The reason we choose titanium butoxide is that the production of its hydrolysis possesses high refractive index and the obtained films have good properties, such as high and continual adjustment of refractive index, high surface hardness and smoothness, high transmittance in visible range as well as good thermal stability.In chapter Three, we use titanium butoxide and Zirconium butoxide as raw material .We fabricated high refractive index Organic-Inorganic hybrid films with ZrO₂/TiO₂ through sol-gel process. However, the hydrolysis speed of titanium butoxide and Zirconium butoxide was extremely fast, so the chelate agents were used to control the hydrolysis speed in traditional method, but it is not suitable for our system due to that they will affect the properties of the hybrid films. Thereby, stepwise hydrolysis was adopted and the obtained films have good properties. Hybrid coatings have high refractive index and its continual adjustment between 1.498-1.54. Films also have high surface hardness and smoothness. Uv-vis spectra proved the hybrid films have good transparency in the visible range.