Abstract
Photo-induced wettability changes in polymer films containing spiropyrans with long alkyl chains are investigated as a function of alkyl chain length and spiropyran content. It was found that spiropyrans with longer alkyl chains easily crystallize in polymer films, leading to a greater change in wettability. It was also found that the size of the formed microcrystals plays an important role in exhibiting photo-induced wettability changes. The wettability change disappeared after repeated photo-irradiation because stress caused by the change in molecular size pulverizes the microcrystals into smaller particles which have no influence on wettability change.
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Hayashida, S., Sato, H. & Sugawara, S. Photo-Induced Wettability Change in Films Containing Spiropyran Microcrystals. Polym J 18, 227–235 (1986). https://doi.org/10.1295/polymj.18.227
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DOI: https://doi.org/10.1295/polymj.18.227