鎖状高分子の誘電緩和についてのノート (III)

-α吸収とβ吸収の理論-

抄録

In one of the preceding papers, the dielectric α-and β dispersions in the amorphous parts of the linear high polymers whose dipoles are long and flexible where discussed with the aid of the “site model.” In this paper, then, the dielectric α-and β-dispersions in the amorphous parts of the linear high polymers whose dipoles are short and rigidly attached to their main chains are investigated theoretically with the aid of the Rouse like equations.
The dielectric β-dispersions in the amorphous parts op this kind op polymers, especially of polyvinyl chloride and polymonochlorotrifluors ethylene, where already investigate in another one of the preceding papers. In that paper, however, the discussions are rather semiphenomenological and, moreover, limited only in the temperatures far below the glass transition temperature (Tg) where the segmental micro-Brownian motions of main chains are not active.
In this paper, the discussions are developed in a little more molecular theoretical way and covered both of the α-and β-dispersions in the whole temperature range. The differences of the dielectric α-and β-dispersion between the amorphous and semi-crystalline polymers are also discussed semi-quantitatively. The results obtained are compared with the observed data in the following three points :
(1) the magnitude of the absorption and its temperature dependence,
(2) the angular frequency of the maximum absorption and the apparent activation energy and
(3) the shape of the absorption curve and its temperature dependence.