高分子の誘電スペクトルに対する架橋ならびにブレンドの効果 : 高分子のレオロジー

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The relaxation time spectrum of the α_a-abosorption of the semi-crystalline polymer is broader than that of the amorphous high polymer, which seems not to have been so satisfactorily explained by many theoretical attempts made so far. The assumptions of these theoretical attempts seem not to be supported by the experimental evidence. We, therefore, attempted to find out experimentally the main cause of this phenomenon. Three possibilities might be considered for the main causes of this phenomenon. The first possibility is the characteristic features of the molecular chain of the semi-crystalline polymer, e.g., the regularity or stiffness of the molecular chain. The second is the network-like structure of the molecular chains in the amorphous part of the semi-crystalline polymer due to the existence of the crystalites. The third id the alteration of the values of the frictional coefficients and the force constants of the molecular chains in the amorphous part owing to the existence of the crystalline part. The first possibility is, however, not so effective in this phenomenon because the amorphous polyethylene terephthalate, for example, shows the dielectric α_a-absorption curve nearly as sharp as that of the usual amorphous polymer. In order to test the second possibility, the molecular chains of polychloroprene were cross-linked by the γ-ray. As a method for testing the third possibility, the effect of blending was investigated. Since polychloroprene and polyvinyl chloride are considered to be nearly amorphous and their glass transition temperatures are far apart from each other, they were respectively adopted as the testing samples. As the segmental micro-Brownian motions of polyvinyl chloride are frozen at the temperature where the α_a-abosorption of polychloroprene is observed, the frozen chains of polyvinyl chloride although it became not so broad by the cross-linking. We could, therefore, conclude that the first and the second possibilities seem not to be so effective for broadening of the shape of α_a-abosorption. The third possibility may, therefore, give a proper model for explanation of this phenomenon. Further investigations, however, will be necessary in order to establish a more detailed model for explaining this phenomenon.
社団法人日本材料学会の論文
1963-05-15

高分子の誘電スペクトルに対する架橋ならびにブレンドの効果 : 高分子のレオロジー

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