Reversible Surface Wettability Change of Polyimide Having Spiropyran Groups by Photo-irradiation

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  • Tsuda Yusuke
    Department of Biochemistry & Applied Chemistry, Kurume National College of Technology
  • Shimogawa Tatsuya
    Department of Biochemistry & Applied Chemistry, Kurume National College of Technology

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The novel polyimide having spiropyran groups on their side chain was synthesized, and the thin films of the polyimide on glass substrates were prepared. It was confirmed that the surface wettability of these films were changed from around 76° to around 67° by UV (365 nm) light irradiation, and the surface wettability were reversibly changed from 67° to 76° by Vis (visible) light irradiation. These wettability changes were photo-cyclized three times. The UV-Vis spectroscopy analysis indicates that the photo-induced isomerization of the spiropyran group leads to reversible changes on the surface of the polyimide films.

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