J. Iran. Chem. Soc., Vol. 8, Supp. 1 February 2011, pp.S161~S168.

Current location: JICS Archive > Vol. 8 > Supplement. 1 > Articles : 18

UV-Degradation Effect on Optical and Surface Properties of Polystyrene-TiO2 Nanocomposite Film

B. Jaleha,*, M. Shayegani Madada, M. Farshchi Tabrizib, S. Habibia, R. Golbedaghic and M.R. Keymaneshd

aPhysics Department, Bu-Ali Sina University, Postal Code 65174, Hamedan, Iran
bMax-Plank Institute for Polymer Research, 55128, Maniz, Germany
cDepartment of Chemistry, Payame Noor University (PNU), Iran
dConstruction Engineering and  Management Department, Payame Noor University (PNU), Iran

Thin films of polystyrene and polystyrene-TiO2 nanocomposite were prepared by spin coating from a polystyrene solution in which TiO2 nanoparticles were dispersed by mechanical mixing. Thin films of polystyrene (PS) and polystyrene-TiO2 nanocomposite were exposed to UV irradiation for varied time intervals. The effect of UV radiation on the optical properties, crystallinity, surface energy and degradation of PS-TiO2 nano-composite has been studied. X-Ray diffraction analysis (XRD), UV-Vis and FTIR spectroscopy, Atomic Force Microscopy (AFM) and contact angle measurement were used to study the induced changes of the properties of the irradiated PS-TiO2 nanocomposite. Optical band gaps and hydrophilicity in UV-irradiated samples were altered by destruction processes. The optical band gap values were found to reduce from 4.54 eV in pure PS to 4.45 eV for PS-TiO2 nanocomposite prior to irradiation. This value is further reduced to 3.46 after UV irradiation for 45 h. 

Keywords: PS-TiO2, UV Degradation, Band gap, AFM, Nanocomposite

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