We developed a regenerable antifouling membrane using photo-dynamic reversible cross-linking. We modified a branched polymer with photo-responsive group, and coated it to a membrane by dip-coating method. The combined results of Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy measurements clearly revealed that the modified polymer were successfully synthesized ,and coated to the membrane by photo-dynamic reversible cross-linking. As expected, the modified film could be detached by UV irradiation. In addition, the photo-reversible membrane surface was recovered decreased water flux by photo-induced regeneration process.

Photo-crosslinkable polyimide(PI) which contains CF3 moiety was synthesized. Polarized UV light transformed ketone group of PI to hydroxyl group, which was confirmed by IR and UV-visible spectroscopy. We investigated the dichroic UV-absorption before and after photo-reaction with linearly polarized light. In particular we have attempted to clarify the relationship between the anisotropy of surface region and surface azimuthal anchoring energy and knew that the anchoring energy of photo-alignment PI is comparable with that of mechanical rubbing.