アクリル酸エステル共重合体の分子運動

概要

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The dielectric dispersions in copolymers of the methyl acrylate with styrene and of the ethyl methacrylate with styrene were measured at the temperature from -75℃ -140℃ in the frequency range of 30 c/s〜100 kc/s. In the copolymers of methyl acrylate with styrene, two distinct tan σ maxima based on α-and β-relaxation processes were observed. The tan σ maximum corresponding to α-relaxation shifted to higher temperature with decrease of methyl acrylate content, while the one corresponding to β-relaxation shifted to lower temperature with decreasing methyl acrylate content. The latter effect is attributed to the dipole-dipole interactions of ester side chains. On the other hand, in the ethyl methacrylate-styrene copolymers, the change in composition did not affect the position of tan σ maximum corresponding to β-relaxation. The values of apparent activation energy of dielectric relaxation were obtained for methyl acrylate-styrene copolymers.
社団法人日本材料学会の論文
1971-05-15