Abstract
The displacement adsorption behavior of poly(methyl methacrylate) (PMMA) and polystyrene (PS) system onto a nonporous silica surface from solution was studied by utilizing the ESR method. The fractions of train segments for these polymers were determined from the ESR spectra analyses, and these values were compared with those of the individual adsorption. When PS was preadsorbed on silica surface to saturation and then excess PMMA solution of known concentration was added and data taken as a function of adsorption time, the amount of PS desorbed from silica surface was found to increase proportionally with adsorption time until finally PS was completely replaced by PMMA. With the displacement of PS from the silica surface, the amount of adsorption for PMMA which saturates the silica surface is obviously lower than that when adsorbed on silica surface individually; that is, the adsorbed PMMA has a flatter conformation than that in the individual adsorption. It also takes a long time for PMMA to adsorb on the silica surface compared with the individual adsorption, because a greater number of PS-silica surface attachments must be ruptured in order to effect displacement.
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Kobayashi, K., Dochi, A., Yajima, H. et al. Time-Dependence of the Displacement Adsorption Behavior of Poly(methyl methacrylate) and Polystyrene System at the Solid-Liquid Interface as Studied by ESR. Polym J 25, 1229–1234 (1993). https://doi.org/10.1295/polymj.25.1229
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DOI: https://doi.org/10.1295/polymj.25.1229
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