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Novel diamine monomer, 4-(phenylazo) 3,5-di(3-aminophenyl) benzoate (Azo-DA) having azobenzene group was synthesized from 4-(phenylazo)phenol as a starting material. The polyimides were synthesized from 3,4’-oxydiphthalic anhydride (3,4’ODPA) or 3,3’,4,4’-diphenylsulfonetetra carboxylic dianhydride (DSDA) as a dianhydride and Azo-DA by two steps polymerization systems. The thin films of obtained polyimide based on DSDA/Azo-DA was irradiated by UV light (λmax; 365 nm), and the contact angle for the water decreased from near 102° to 88°, and the contact angle recovered from 88o to 96o by Vis light irradiation. This reversible control of surface wettability of the polyimide having azobenzene group by UV-Vis light irradiation was analyzed by solid-state surface reflected UV-Vis spectra and XPS measurements. Although the reversible wettability change of polyimide based on 3,4’-ODPA/Azo-DA was also observed, the degree of wettability changes was small.

Reversible Control of Surface Wettability of Polyimides Having Azobenzene Group on Their Side-chain by UV-Vis Light Irradiation