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The effect of processing conditions on structure evolution in melt spun poly(ethylene terephthalate) fibers
Author(s) -
Napolitano M. J.,
Moet A.
Publication year - 1986
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.1986.070320521
Subject(s) - crystallite , materials science , differential scanning calorimetry , scanning electron microscope , poly ethylene , composite material , polymer , fiber , ethylene , diffraction , optics , chemistry , thermodynamics , biochemistry , physics , metallurgy , catalysis
An investigation has been made into the structural evolution in poly(ethylene terephthalate) fibers as a function of wind‐up speed (WUS) and quench air temperature (QAT). Analysis of the mechanics and mechanisms of cold drawing reveals that the fiber structure is heterogeneous. Evidence from differential scanning calorimetry (DSC) and density measurements indicates the presence of crystallites which are imperfect according to wide‐angle diffraction (WAXD). Increased thread‐line stress (higher WUS and higher QAT) appears to induce larger and more oriented crystallites in a progressively oriented matrix. A radially layered structure is disclosed from high resolution scanning electron microscopy (SEM) micrographs.