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High speed spinning of poly(ethylene terephthalate)—II: Orientation induced mechanism of cold crystallization in pre-orientated yarns

✍ Scribed by G. Bragato; G. Gianotti

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
400 KB
Volume
19
Category
Article
ISSN
0014-3057

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✦ Synopsis

The kinetics of the "cold crystallization" of poly(ethylene terephthalate) (PET) pre-orientated yarns are investigated both in isothermal and in non-isothermal dynamic conditions. The amorphous-crystalline, solid-solid transformation is analyzed in terms of the Avrami equation and of Ozawa's theory. The nucleation and growth mechanism is a function of PET amorphous molecular orientation and changes from a three dimensional (n = 4) to a two dimensional and one dimensional disc-like or rod-like growth. The molecular orientation may be defined as the best "nucleating agent" for PET overall rate of crystallization in the low temperature region.

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