Dielectric β-Relaxations in Some Linear High Polymers

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The dielectric β-dispersions in the amorphous part of the linear high polymers may be roughly classified into two categories according to their mechanisms: the first is the dielectric dispersions in the polymers which have long flexible dipoles, and the second is those which have rather short dipoles rigidly attached to their main chains. While the β-dispersions in the polymers of the first group are inferred to be mainly due to the micro-Brownian motions of their long dipoles, no convincing theory referring to the mechanism of those of the second group has been proposed up to present.<BR>In this paper, the dielectric β-dispersions of these second group polymers are investigated. The approximate magnitudes of some quantities appearing in our theory are evaluated by the observed values obtained from the mechanical dispersion. Taking account of the phenomenological nature of our theory, agreements between the theory and the observations may be satisfactory.

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