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Conditions of homogeneous deformation of poly(ethylene terephthalate) films during uniaxially drawing
Author(s) -
Sun Nanjian,
Yang Juan,
Gu Qun,
Shen Deyan
Publication year - 2000
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 - 10.1002/1097-4628(20000829)77:9<2044::aid-app21>3.0.co;2-k
Subject(s) - crystallinity , materials science , crystallization , differential scanning calorimetry , amorphous solid , slippage , deformation (meteorology) , composite material , poly ethylene , relaxation (psychology) , atmospheric temperature range , ethylene , polymer chemistry , thermodynamics , crystallography , chemistry , psychology , social psychology , biochemistry , physics , catalysis
Amorphous poly(ethylene terephthalate) film was uniaxially drawn over a wide range of temperatures from below to above the T g at a constant strain rate. The geometry of the deformation in macroscopic dimensions of the sample demonstrates that homogeneous deformation can be obtained when the drawing temperature ( T def ) is not lower than 69°C. The change of the cold crystallization peak temperature ( T cc ) and crystallinity determined by differential scanning calorimetry and density measurement, respectively, were studied in terms of the T def and the draw ratio (λ). The orientation, relaxation, and crystallization during drawing were investigated as a function of T def as well as of λ. The results suggest that 69°C is the critical temperature at which the sample with the highest orientation and the least slippage of the molecular chain and without obvious crystallization can be obtained. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2044–2048, 2000