Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Fine Structure Formation and Physical Properties of Poly(butylene terephthalate) Fibers in High Speed Melt Spinning

고속 방사된 폴리부틸렌 테레프탈레이트 섬유의 미세구조 형성과 물성

  • Lee Sun Hee (Department of Textile Engineering, Pusan National University) ;
  • Cho Hyun Hok (Department of Textile Engineering, Pusan National University)
  • 이선희 (부산대학교 섬유공학과) ;
  • 조현혹 (부산대학교 섬유공학과)
  • Published : 2004.12.01
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Abstract

The effect of take-up velocity on the fine structure and properties of PBT fibers are investigated using WAXD, density, birefringence, DSC, dynamic viscoelasticity, TMA, tensile test, etc. An increase in take-up velocity caused an increase in both the density and the birefringence. In the results of WAXD equatorial profiles, the increase in the take-up velocities resulted in the formation of (010) and (100) reflections of $\beta-crystal$ and the reflection peak became sharper at the take-up velocity of 6 km/min. The initial modulus of the fiber increased when the g' fraction increased, the tenacity depended more on fractions of $\alpha-crystal$, i.e. the total crystallinity. The thermal properties of high speed spun PBT fibers were measured with DSC, dynamic viscoelasticity, TMA, etc. Endothermic curves became sharper with increasing take-up velocities, and endothermic melting peaks are shifted to high temperatures. Therefore, crystal structure was well developed in the fiber obtained at high take-up velocities. The $tan\delta$ peak is shifted and the intensity is decreased with temperature. That is, the packing density of the PBT fiber is high when the take-up velocity and orientation of amorphous region is increased. The shrinkage has a tendency to decrease with increasing take-up velocity.

Keywords

References

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