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Orientation of precrystallized poly(ethylene terephthalate)
Author(s) -
Jabarin S. A.
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760311412
Subject(s) - crystallinity , materials science , shrinkage , composite material , poly ethylene , modulus , orientation (vector space) , ethylene , strain hardening exponent , hardening (computing) , geometry , layer (electronics) , chemistry , mathematics , catalysis , biochemistry
The orientation characteristics of crystalline poly(ethylene terephthalate), PET, were studied as a function of degree of crystallinity, orientation temperature, and stretch ratio. Oriented samples were analyzed with respect to mechanical, shrinkage, and barrier properties. The results show that (a) significant impact property improvement can be achieved by orienting crystallized PET, (b) the modulus, ultimate strength, and yield stress increase with orientation of precrystallized PET, (c) the initial degree of crystallinity can affect the strain‐hardening properties of PET, and (d) the total amounts of shrinkage and shrinkage stress of stretched PET increase with increasing amounts of crystallinity before orientation.