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Effect of winding speed on the physical structure of as‐spun poly(ethylene terephthalate) fibers, including orientation‐induced crystallization
Author(s) -
Heuvel H. M.,
Huisman R.
Publication year - 1978
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1978.070220815
Subject(s) - crystallization , materials science , amorphous solid , differential scanning calorimetry , ethylene , poly ethylene , diffraction , composite material , molecule , polymer , crystallography , polymer chemistry , chemical engineering , optics , chemistry , thermodynamics , organic chemistry , physics , engineering , catalysis
As‐spun fibers of poly(ethylene terephthalate), PET, made at winding speeds ranging from 2000 to 6000 m/min exhibit quite different physical structures. Yarns wound at relatively low speeds are amorphous, whereas those spun at high speeds contain well‐developed crystals of closely packed molecules. In this study the structures have been characterized by means of various techniques such as differential scanning calorimetry, x‐ray diffraction, density, and pulse propagation measurements. Based on the results obtained, an arrangement of the molecules in the various yarns is proposed. It is shown that these arrangements can account for the extreme wide variety in contraction behavior found experimentally. Finally, the results obtained are compared with those of other investigations into orientation‐induced crystallization.