Abstract
On the basis of the experimentally determined phase behavior in blends of polystyrene and random copolymers of styrene and 4-vinylpyridine, i.e., P(Sx-co-4VP1-x)/PS, the Flory−Huggins interaction parameter is demonstrated to satisfy 0.30 < χS,4VP ≤ 0.35. This value is substantially smaller than reported before. To corroborate our results, a similar study was performed using 2-vinylpyridine leading to 0.09 < χS,2VP≤ 0.11, in excellent agreement with the well-established value of χS,2VP = 0.1.
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