抄録
Interference color is well known as one of the systems to display various colors. By using this system, we tried to
develop novel method for the brief estimation of molecular sorption and diffusion in polymer thin-film. We prepared
polymer thin-film (polystyrene and polyvinyl alcohol) on the silicon substrate by spin-coat method and dipping
method. Reflected visible light at air/polymer and polymer/silicon are interfered each other, and prepared thin-film
showed various colors depending on its thickness and refractive index. By the sorption of various small molecules,
polymer thin-films swelled and its interference color changed drastically. Degrees of changes in thickness and
refractive index of polymer thin-film are able to be estimated by the degree of interference color changes and Bragg’s
law and Snell’s law. An almost linear relation between thickness changes in polymer thin-film and solubility parameter was observed by the reflective VIS spectrum measurements of prepared polymer thin-films under various solvent
vapors. By this simple method, molecular sorption and diffusion behavior in polymer thin-film could be visualized.
This system will give anew brief method for the estimation of polymer - penetrant affinity.
