ポリプロピレン繊維の粘弾吸収と微細構造 : 高分子のレオロジー : レオロジー特集号

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Structure of fibers of isotactic polypropylene (PP) was investigated by the effects of isotacticity of raw materials and extraction with several solvents upon temperature characteristics of dynamic modulus, E', and dynamic loss, E". E' and E" of PP fibers were measured at 100 c/s using the direct reading dynamic viscoelastometer. The specimens were prepared by drawing the quenched film to the seven times of the original length at 95℃. Two remarkable absorptions were observed for all specimens : the α_a absorption located at about 20℃ ascribed to the amorphous region and the α_c absorption located at about 100℃ ascribed to the crystalline region. The intensities and temperatures of these absorption maxima are shown in Table 2. In the extreme case, where the amorphous region (A) and the crystalline region (C) have the respective characteristic relaxation mechanisms and are combined in parallel with respect to transmission of applied stress, there consists the fundamental relation that two absorptions appear at temperatures characteristic of the regions of A and C and their intensities are proportional to the volume fraction of each corresponding phase. On the contrary, only one absorption appears in the A-C series model. The relations of Fig. 1 are qualitatively interpreted by the A-C parallel model. In this case, it is essential for appearance of the α_c absorption that the fibrils formed with continuous crystalline phase, scarcely interrupted by the amorphous region in the course of stress-transmission, exists in the structure of fiber, while some defects of crystal lattice may be contained within the fibrils. On the other hand, the amorphous region causing the α_a absorption will exist in the interfibrillar space and also perhaps between crystallites as seen in the fringed micell model heretofore accepted.
社団法人日本材料学会の論文
1962-05-15

ポリプロピレン繊維の粘弾吸収と微細構造 : 高分子のレオロジー : レオロジー特集号

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