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Electrical β-Relaxation of Die-drawn Isotactic Polypropylene

✍ Scribed by Abdul Jawad, S.; Alnajjar, A.

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 348 KB
Volume: 40
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(199608)40:4<295::aid-pi561>3.0.co;2-l

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✦ Synopsis

Measurements of a.c. impedance were carried out in the frequency range 1 Hz to lo6 Hz at room temperature on isotropic and die-drawn isotactic polypropylene. It was found that the a.c. impedance decreases with increasing draw ratio in the frequency range 1 Hz to lo4 Hz and then becomes independent of draw ratio with increasing frequency. A dramatic drop in the a.c. impedance was observed in the frequency range lo4 to 106Hz, which is associated with a 8-relaxation process. The intensity of the 8-relaxation peak decreases with increasing draw ratio and nearly disappears for a draw ratio of 16.8. The Cole-Cole plots show good semicircles for isotropic and die-drawn samples indicating that a certain polarization mechanism is dominant in polypropylene.

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