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Time-dependent effect of spherulite size on the tensile behavior of polypropylene

✍ Scribed by L. S. Remaly; J. M. Schultz

Publisher
John Wiley and Sons
Year
1970
Tongue
English
Weight
557 KB
Volume
14
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

The mechanical behavior of isotactic polypropylene following primary crystallization is known to be dependent on the aging time (e.g., at room temperature). This aging time effect is believed to be related to a form of additional crystallization (sometimes called secondary crystallization). We show in the present work that the aging characteristics depend on spherulite size and that indeed the spherulite size effects reported by others very likely reflect chain rearrangements upon aging, rather than some property associated with the as‐crystallized material.

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## Abstract Melt history, pressure, and crystallization temperature are three variables that may be used to vary spherulite size in polymer systems. In this study, bulk polypropylene samples were given various melt treatments and then isothermally crystallized under constant pressure. Spherulite si