Effect of Molecular Weight on Dielectric Absorption of Polyvinylacetate

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概要

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• The dieiectric β-absorption of linear high polymer has been studied by many investigators, but the studies on the relationship between the degree of polymerization and the dielectric absorption are Very few. It has been reported only for the dielectric α-absorption of the high molecular weight polyvinylacetate that the relaxation time is affected by the degree of polymerization. Reddish concluded that the dielectric β-absorption of polyethylenetele-phtbalate is due to the rotational motions of the chain end dipoles in the amorphous part. Furthermore, Yamafuj suggested for polyvinylchloride that the β-absorption would be due to the deformations accompanied by rather small changes of the directions of the dipoles, because the magnitude of the dielectric β-absorption of this polymer is not dependent on the degree of polymerization. We have recently measured the dielectric absorptions of low molecular weight polyvinyiacetate (PVA_c) having different degree of polymerization (n). These specimens are prepared by the solution polymerization and their degrees of polymerization, as determined by their intrinsic viscosities, are shown in Table I. The temperature dependence of the magnitude of the β-absorption (ε_0-ε_∝)_β at various degrees of Polymerization is shown in Fig. 1. The magnitude of absoption is determined from the observe ddata by the following equation ε_0-ε_∝=2/π∫ε〃d(I_nω), (1) where ε_∝ is the dielectric constant at very high frequency at which the orientation of any dipole is impossible, and ε_0 is the static dielectric constant.

• 社団法人日本物理学会の論文
• 1964-06-05

著者

• HARA Tohru

  Matsushita Research Institute Tokyo, Inc.

• Hara Tohru

  Matsushita Research Institute Tokyo Inc.

• Hara Tohru

  Matsushita Research Institute Tokyo

• OKAMOTO Shigeharu

  Department of Applied Physics, Waseda University

• Okamoto Shigeharu

  Department Of Applied Physics Wasada University

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