誘電緩和現象における時間-温度換算法則の適用限界について : 高分子レオロジー

概要

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Ferry, Williams and Fitzgerald applied the time-temperature superposition law to the results of the dielectric measurements of amorphous polymers and succeeded in obtaining the distribution curves of relaxation times over a wide range. They, however, did not apply it to semi-crystalline polymers. In high polymers, whether they are amorphous or semi-crystalline, the two dielectric absorptions i.e., the so-called α-absorption or the higher temperature absorption and the so-called β-absorption or the lower temperature absorption, can be usually observed. Ferry et al. applied the law only to the α-absorption of the two dielectric absorptions. When the shape of the curves of ε vs. log f rapidly changes with temperature, it is noticed that the data at different fixed temperatures can not be superposed, but when they change gradually with temperature, there is the danger of the distribution curve of ralaxation times being built by composing the parts of the distribution curves which actually change with temperature. Especially when the frequency range of measurement is as small as in the case of viscoelastic measurement, the danger is likely to increase. On the contrary, when mutual inductance bridge is used, the dielectric measurement can be done over a wide frequency range, hence, the check for the above mentioned fact becomes possible.
社団法人日本材料学会の論文
1960-04-15