tIn this work, polycarbonate–TiO2nanocomposite films were prepared with two different percentages.The structure of samples were studied by X-ray diffraction. Thermal stability of the nanocomposites wasstudied by thermogravimetric analysis (TGA). The polycarbonate and polycarbonate–TiO2nanocompos-ite films were exposed by UV light at different irradiation times. The effects of UV irradiation on thesurface properties of samples have been studied by different characterization techniques, viz. scanningelectron microscopy (SEM), FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), contact anglemeasurement and Vickers microhardness tester. Hydrophilicity and surface energy of UV treated sam-ples varied depending on UV irradiation time. TGA curves showed that nanocomposite films have higherresistance to thermal degradation compared to polycarbonate. XPS analysis shows that surface of sam-ples become more oxidized due to UV irradiation. For nanocomposite film, the smallest contact angle wasobserved in association with the longest UV irradiation time. The contact angle significantly decreasedfrom 90◦to 12◦after 15 h of UV irradiation. It is observed that the hardness of the nanocomposite filmsincreases after UV irradiation
