Abstract
AbstractMiscibility in statistical AB/AB copolymers was investigated from the viewpoint of the copolymer sequence effect based on the Balazs theory. The AB copolymers used were poly[(p‐chlorostyrene)‐co‐(hexyl methacrylate)], poly(styrene‐co‐HMA) and poly[(methyl methacrylate)‐co‐HMA]. Miscibility in the former two systems displayed deviation from the Flory–Huggins theory extended to statistical copolymers, and such behavior was interpreted as the sequence effect based on the Balazs theory. From calculations of the probabilities, Z, of interactions between triads, changes in Z for AAA/BBB, AAA/BBA, AAA/ABA, AAB/BBB and BAB/BBB were remarkable around the miscibility boundaries. In order to obtain insight into the miscibility behavior, we related the interaction parameters for the triads, i.e. χAAA/BBA = χAAA/ABA, χAAB/BBB = χBAB/BBB, and χAAB/BBA = χBAB/BBA = χAAB/ABA = χBAB/ABA. Using the above treatment, the χ parameters were estimated from the experimental miscibility data. Reproducibility in miscibility was good for all of the systems. In addition, the parameters were comparable to those obtained by using the Cantow–Schulz assumption. Copyright © 2004 Society of Chemical Industry
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