The photodegradation of the silicone surfactant-TiO2 composite films was characterized by FTIR, Raman spectroscopy, and scanning electron microscope. After photocatalytic degradation, the FTIR Si-O-Si peak intensity of the composite film remained unchanged, implying no cleavage of Si-O-Si bond. The above Si-O-Si peak intensity is sensitive to the polyoxyethylene chain length of the composite. The PEG10000-silicone composite is more resist-ant to photodegradation than those composites with lower molecular weight of constituent PEGs. The wetting rates of the silicone surfactant-TiO2 composites showed that modified silicone composite films exhibited hydrophobic nature. (c) 2006 Wiley Periodicals, Inc.