Abstract
The molecular motion of polystyrene in solution has been investigated quantitatively using carbon-13 NMR. It is concluded that the motion can be characterized by three contributions, namely, segmental motion and two kinds of internal rotation of the phenyl ring, and that the phenyl ring is rotating more freely above 50°C. Free rotation of the phenyl ring is hindered by a energy barrier, which is probably due to a steric hindrance between the hydrogens in the phenyl ring and the methine hydrogen in the adjacent monomer unit. This model is consistent with the fact that a transition of polystyrene at about 50°C occurs both in solutions and in bulk.
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Inoue, Y., Konno, T. A Carbon-13 NMR Study of Molecular Motion of Polystyrene in Solution. Polym J 8, 457–465 (1976). https://doi.org/10.1295/polymj.8.457
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DOI: https://doi.org/10.1295/polymj.8.457
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