Abstract
An ABA-type water-soluble block polyelectrolyte, i.e., ionene–oxyethylene–ionene tri-block copolymer, was prepared by the quarternization reaction of the one end of 3-3 ionene polymer (A) with end-brominated poly(oxyethylene) (B). Since the block copolymer was surface active, the surface tension of the aqueous KBr solutions of poly(oxyethylene) glycol was measured. The surface activity of the block copolymer strongly depended on the salt concentration, in comparison with that of poly(oxyethylene) glycol. The measurements of the adsorbed amount and the thickness of the adsorbed block copolymer and also those of poly(oxyethylene) glycol at the air–water interface were carried out by ellipsometry as a function of KBr concentration. The adsorbed amounts of the block copolymer and the poly(oxyethylene) glycol were independent of KBr concentration. The area occupied by a block copolymer was almost identical with that of poly(oxyethylene) glycol spread as a monolayer. The thickness of the adsorbed block copolymer was larger than the end-to-end distance of ionene and increased with decreasing KBr concentration, while that of the poly(oxyethylene) glycol showed the same trend but did not exceed 15 Å. It was inferred that the ionene blocks protrude into the aqueous phase, whereas the central block of poly(oxyethylene) almost lie flat on the water surface.
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Kawaguchi, M., Oohira, M., Tajima, M. et al. An Ellipsometric Study of the Conformation of an Ionene–Oxyethylene–Ionene Tri-Block Copolymer at the Air–Water Interface. Polym J 12, 849–855 (1980). https://doi.org/10.1295/polymj.12.849
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DOI: https://doi.org/10.1295/polymj.12.849
