Molecular weight dependence of fiber structure development in the laser drawing of poly(ethylene terephthalate) fibers

The effect of molecular weight on fiber structure development during the continuous neck-drawing of the amorphous poly(ethylene terephthalate) (PET) fiber was investigated by fiber temperature measurements and online WAXD analysis. The fiber temperature was also simulated using the energy balance eq...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2009-09, Vol.47 (17), p.1653-1665
Main Authors: Kim, Kyoung Hou, Yamaguchi, Takayoshi, Ohkoshi, Yutaka, Gotoh, Yasuo, Nagura, Masanobu, Urakawa, Hiroshi, Kotera, Masaru, Kikutani, Takeshi
Format: Article
Language:English
Subjects:
Applied sciences
CO2 laser drawing
Exact sciences and technology
Fibers
Fibers and threads
Forms of application and semi-finished materials
Mathematical analysis
Molecular structure
Molecular weight
neck deformation
On-line systems
online measurements
poly(ethylene terephthalate) fiber
Polyethylene terephthalates
Polymer industry, paints, wood
Simulation
structure
Technology of polymers
Two dimensional
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Summary:The effect of molecular weight on fiber structure development during the continuous neck-drawing of the amorphous poly(ethylene terephthalate) (PET) fiber was investigated by fiber temperature measurements and online WAXD analysis. The fiber temperature was also simulated using the energy balance equation. The simulated temperature increased differently with molecular weight immediately after the neck point, while the measured temperature showed no difference. The difference in the simulated temperature was caused by the potential energy increase with increasing molecular weight, which would result in a retardation effect in the initial stage of fiber structure development. Online X-ray measurements were carried out with a time resolution of 0.5 ± 0.06 ms. A two-dimensionally ordered mesophase was formed within 1 ms after the neck point and developed into a microfibrillar structure. The time required for the disappearance of the two-dimensionally ordered structure increased with increasing molecular weight, leading to a retardation effect. No molecular weight dependence was observed in the rate of transformation from the two-dimensionally ordered structure to the PET crystal.
ISSN:0887-6266
1099-0488
1099-0488
DOI:10.1002/polb.21769