Comparison of the structure-property relationships for PTT and PET fibers spun at various take-up speeds |
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| Authors: | Joon Ho Kim Sung Sig Yang Samuel M Hudson |
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| Institution: | 1.School of Textiles,Yeungnam University,Gyeongsan,Korea;2.College of Textiles,North Carolina State University,Raleigh,USA |
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| Abstract: | A comparison of poly(trimethylene terephthalate)(PTT) and poly(ethlene terephthalate)(PET) fibers spun at various take-up
speeds was presented. Fiber characterization included tensile and thermal properties, optical birefringence, density, sonic
modulus, boil-off shrinkage, and wide-angle X-ray diffraction. The phenomenon of stress-induced crystallization was inferred
from the X-ray diffraction diagrams for fibers spun with take-up speeds over 4000 m/min. The tenacity and elongation of PTT
and PET fiber showed typical results, but the initial modulus of PTT fiber was nearly unchanged over the entire take-up speed
range (2000–7000 m/min), whereas that of PET, as expected, increased monotonically with increasing take-up speed. This divergent
behavior could be explained by the different molecular deformations in the c-axis as determined from X-ray diffraction patterns.
The fiber crystallinity, density, and heat of fusion of both polymers increased with take-up speed. The boil-off shrinkage
decreased with increasing take-up speed. The optical birefringence of the two fiber types showed a maximum level at a take-up
speed of ca. 5000 m/min. The melting temperature behavior of PTT fiber was different from that of PET fibers. It was found
that PTT is less sensitive to stress induced changes at high spinning speeds than is PET. |
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