Study of Preparation and Properties of (Polymer /TiO2) NanoComposites

In recent years, there has been considerable interest in Polymer / TiO2 Nano Composites due to their novel mechanical, photocatalytic activity, optical properties and electronic application, which are rarely present in the pure polymer or conventional composites. With modified surface of nano scale TiO2 and better dispersion of nano particles in polymer matrix, mechanical properties of nanocomposite is better than pure polymer. Photocatalytic activity of TiO2 / nano composites is reversible and this activity increase by increasing the pH of environment. The large surface area of nano fillers causes that the interaction between the nano particle surface and the surrounding chains polymer higher than interaction between chains polymer. These interactions cause the enhancement or restriction of chain mobility near the particle surface and could significantly affect morphology in their formed nanocomposites. With decreasing the size and amount of nano scale TiO2 in nano Composite, optical properties are improved. High dielectric constant nano- TiO2 causes that dielectric constant of TiO2 nanocomposites is better thant pure polymers.