| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 100 === This study investigated the properties of thin films, which comprised of photochromic spiropyran and polymer blends. These thin films were obtained by the phase-separation-induced crystallization of spiropyran. Upon the irradiation of UV light, spiropyran become weak-hydrophilic molecule because the scission of the C-O pyran bond was occurred in spiropyran. The UV light-induced isomerization could be reversed by using visible light (530 nm) again. The properties of thin films were studied according to the effects of polymer matrix, solvent annealing, amount of spiropyran in polymer, and intensity of UV light. It was found that the photo-controllable wettability could be attributed to the change in surface roughness and morphology. The more crystalline structures are formed on the surface, and the difference of wettability will be enhanced after irradiating UV light. Under the different annealing conditions, different spiropyran and polymer blends will form different surface morphology. The method of solvent annealing can cause spiropyran and polymer blends form self-assembled crystalline structure on the surface. It can assist this polymer surface to have large wettability difference. The difference in contact angle can reach above 70 degree after irradiation of UV light by using solvent annealing.
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