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The crystal structure and drawing induced polymorphism in poly(aryl ether ketone)s, 3. Crystallization during hot-drawing of poly(ether ether ketone ketone)

✍ Scribed by Shanger Wang; Tianxi Liu; Zhishen Mo; Junzuo Wang; Feng Xu; Zhongwen Wu

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 407 KB
Volume: 18
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1997.030180203

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✦ Synopsis

Abstract

The evolution of crystallinity and polymorphism during hot‐drawing of amorphous poly(ether ether ketone ketone) (PEEKK) as a function of strain rate, draw ratio, and temperature was investigated. In modification I, the competition of chain extension and molecular alignment is responsible for the strain rate and temperature dependence. Modification II crystallization is basically controlled by chain extension during stretching. The former can be transformed into the latter via relaxation during stretching or annealing at elevated temperature.

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