Title:
Analysis of structural development during superdrawing of poly(ethylene terephthalate) fibers
Analysis of structural development during superdrawing of poly(ethylene terephthalate) fibers
Author(s)
Jain, Vibhor
Advisor(s)
Wang, Youjiang
Jacob, Karl I.
Jacob, Karl I.
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Abstract
A comprehensive experimental study was conducted to determine the limitations in processing conditions for superdrawing. Experimental studies were carried out by uniaxial drawing tests at temperatures from 90 to 120°C and at strain rates ranging from 0.008/s to 0.425/s. Crystallinity and orientation of the drawn samples were evaluated using differential scanning calorimetry and birefringence measurements. This study revealed that increasing temperature from 110°C to 120°C leads to more crystallization at low strain rates (0.001/s), and less crystallization at high strain rates (0.1/s). Furthermore, it was shown for the first time that the mechanism of crystallinity development in PET undergoes a transition at draw temperature of 113°C and strain rate of 0.17/s.
A new one-dimensional constitutive model was developed to predict the stress-strain behavior of PET fibers as they are drawn to very large draw ratios (up to 10) over a wide range of temperature (90-120°C) and strain rate (0.008-0.425/s). The model was based on the rubber elasticity theory and non-linear viscoelasticity.
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Date Issued
2009-01-09
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Text
Resource Subtype
Dissertation