Abstract
The dielectric β-relaxation process of poly(2-vinylpyridine) was found to be scarcely affected by the stereoregularity, in contrast to the α process. For the β process of isotactic and a tactic samples, the following facts were observed: (1) the dielectric behavior for an isotactic sample is similar to that for an atactic one; (2) from the conformational analysis for an isotactic sample, two equilibrium states exist in the rotation of the pendant pyridine ring and, between the two states, both potential and dipole moment differences estimated from the calculation agree with those obtained experimentally; and (3) when the main chain is distorted at the activated position of the rotation of the pendant group, the height of the potential barrier is calculated to be equal to the activation energy determined experimentally. Hence, it was inferred that the β-relaxation process for isotactic and atactic poly(2-vinylpyridine)s can be attributed to the restricted rotation of pendant pyridine rings accompanying a distortion of the main chains.
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Sanno, N., Murakami, I. & Yamamura, H. Dielectric β-Relaxation in Poly(2-vinylpyridine). Polym J 8, 231–238 (1976). https://doi.org/10.1295/polymj.8.231
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DOI: https://doi.org/10.1295/polymj.8.231