Polystyrene block copolymers containing triethoxysilyl (TES) groups were synthesized by a living anionic polymerization and the subsequent functional group transformation reactions. Then thin polymer films were applied for the reaction with organic acid to form Si-O bonds at the film surface. Surface concentration of Si was confirmed by X-ray photoelectron spectroscopy (XPS) measurement for the resulting polymer film. In addition, contact angle of water droplet for the film increased after acid

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... treatment. These results clearly showed that the polysiloxane substrate was prepared at the outer most surface by treatment with organic acid.