Dynamic Mechanical and X-Ray Studies of Annealed Isotactic Polypropylene

概要

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Isotactic polypropylene specimens are annealed at temperatures between 90 and 150℃. Viscoelastic properties are studied by the lateral vibration method. The percent crystallinity and crystallite size are studied by X-ray diffractometry. Annealing at a higher temperature results in a higher density of the specimen. In general more crystallization occurs in the specimen when it is annealed at a higher temperature. Young's modules is of the order of 10^<10> dyne/cm^2, which increases slightly with the rise in the annealing temperature. The β-peak of the vibration loss tan δis observed around 10℃. The activation energy of the β-peak calculated from the temperature shift of the peak is 28 kcal/mole for the original sample, and 34-40 kcal /mole and 56-58 kcal /mole for the samples annealed at 90℃ and 150℃, respectively.
社団法人応用物理学会の論文
1976-02-05