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Evolution of hot strain induced crystalline texture of poly(ethylene terephthalate) films
Author(s) -
Dargent E.,
Grenet J.,
Dahoun A.
Publication year - 1997
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.11835
Subject(s) - materials science , crystallinity , texture (cosmology) , differential scanning calorimetry , crystallite , amorphous solid , composite material , poly ethylene , ethylene , birefringence , fiber , crystallography , optics , thermodynamics , metallurgy , biochemistry , chemistry , image (mathematics) , physics , artificial intelligence , computer science , catalysis
Differential scanning calorimetry, birefringence and X‐ray poles figure analysis were used to characterize the evolution of the strain induced crystalline texture of poly(ethylene terephthalate) films. The films are initially wholly amorphous and drawn above the glass transition temperature. For a critical draw ratio, a crystalline phase appears with a weak crystalline fiber texture. For the highest draw ratio we observe that the texture is better defined, and the drawing tends to align the crystallites with the draw direction and to increase slightly the degree of crystallinity. For the highly drawn sample an extra texture is also observed.