Abstract
Light-scattering studies were made in order to examine conformational anomalies exhibited by solutions in p-xylene (pXY) of nearly equimolar AB-diblock and BAB-triblock copolymers, wherein A denotes polystyrene (PST) and B poly(methyl methacrylate) (PMMA). Particle-scattering function P(θ) was calculated on two simplified models: one is a micelle consisting of f molecules of AB-diblock type, of which B-subchains constitute the core (star-shape model); and the other represents a BAB-triblock molecule, in which two side B-subchains undergo intramolecular association, forming a droplet, and the conformation of A-subchain is restricted by this droplet (arc-shape model). The calculated P(θ) functions were compared with the experimental data obtained in pXY solution at 30°C from AB-diblock and BAB-triblock samples. It was found that the star-shape model fits closely the behavior of the AB-diblock system; whilst the arc-shape model appears to give a reasonable description of the behavior of the BAB-triblock system (although the results are not completely conclusive).
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Tanaka, T., Kotaka, T. & Inagaki, H. Thermodynamic and Conformational Properties of Styrene–Methyl Methacrylate Block Copolymers in Dilute Solution. V. Light-Scattering Analysis of Conformational Anomalies in p-Xylene Solution. Polym J 3, 338–349 (1972). https://doi.org/10.1295/polymj.3.338
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DOI: https://doi.org/10.1295/polymj.3.338