高分子の緩和過程と温度の関係 : 高分子レオロジー
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概要
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The dielectric properties of five crystalline polymers and four amorphous polymers have been measured over the frequency range of 10^<-1> cps ( or 10^<-4> cps for four polymers) to 10^6 cps and the wide temperature range. Two or three dielectric absorptions which have been designated as α, β and γ absorption with descending temperature have been observed for each polymer and all absorptions are due to the molecular motions in the amorphous region. In the crystalline polymers, mechanisms of these absorptions have been discussed using results of the studies of the crystall growth processes. In vinylidene chloride copolymer, polychlorotri-fluoroethylene, polyoxymethlene and polyhexamethylene adipamide, the crystall growth has been detected by the density or X ray measurement in the temperature range where only the β absorption can be observed and the α absorption cannot be observed. Moreover the βabsorption is related to the glass transition. Consequently it is concluded that the β absorptions of the four polymers are due to the motions of the main chains in the amorphous region. Supposing that the α absorptions of the four polymers are due to the motions of the main chains in strained amorphous region, the region has been searched by the dielectric measurements of polychlorotri-fluoroethylene samples having different degree of crystallinity. It two samples having different size of crystallites are compared at the same degree of crystallinity, the magnitude of the β absorption of the sample having larger crystallites is greater than that of the sample having smaller crystallites but the magnitude of the α and the β absorption may be coincide with each other at the melting temperature. Consequently it is conjectured that the strained amorphous region is the surroundings which extend to a definite distance from crystallites and the amorphous region is the region between the strained amorphous regions.
- 社団法人日本材料学会の論文
- 1960-04-15
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