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Effects of annealing and atactic fraction on structural properties of isotactic polypropylene

✍ Scribed by Hiroshi Tanaka; Fumie Kōrogi

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
358 KB
Volume
24
Category
Article
ISSN
0014-3057

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✦ Synopsis

Effects of annealing and atactic fraction on structural properties of isotactic polypropylene were investigated using various methods which included X-ray, NMR and DSC. Annealing at elevated temperatures results in considerable increases in crystallinity, ~m, crystal thickness, lc, heat of fusion, AH, mass fraction of rigid region, F~, and spin-lattice relaxation time, T~. There are good correlations between Ic and Fc, 7"1 and Fc, l~ and AH. The effect of the atactic fraction is strongly shown in the value of T2a ; T 2 corresponds to motion in the mobile amorphous regions, indicating that the presence of a large atactic fraction facilitates motion in the amorphous regions.

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## Abstract Dry and wet annealing of isotactic polypropylene fibers was carried out under constant length at 120°C in air and in glycerine environments with annealing times ranging from 1 to 30 h. A detailed analysis of the infrared spectrum of samples annealed, especially in air, showed clear evid