Fine Structure Formation and Physical Properties of Poly(ethylene 2,6-naphthalene dicarboxylate) Fibers in High-Speed Melt Spinning

Poly(ethylene 2,6-naphthalene dicarboxylate) 섬유의 고속방사에 따른 미세구조 형성과 물성

  • 조현혹 (부산대학교 섬유공학과) ;
  • 이화경 (부산대학교 섬유공학과) ;
  • 김주애 (경상대학교 의류학과) ;
  • Published : 2001.11.01

Abstract

PEN fibers of two different molecular weights. low and high, were prepared by high-speed melt spinning. The fine structure and physical properties of PEN fibers were investigated with various techniques such as wide-angle X-ray diffraction, birefringence, density. DSC, dynamic viscoelasticity, and tensile testing. From the WAXD test, PEN fibers of high molecular weight was found to have a reflection peak associated with orientation-induced crystallization that started to appear at take up velocities above 3km/min. In this region, the crystalline structure was dominated by $\beta$ form crystal. This tendency was also confirmed by DSC thermogram, density, and birefringence data. In the DSC thermograms, the melting peak shifted to higher temperature with increasing take-up velocity, while the area of cold crystallization peak decreased. Especially, the temperature of melting peak increased remarkably with increasing take-up velocity in the range of 2$65^{\circ}C$ to 298$^{\circ}C$ for PEN fibers of high molecular weight. Mechnaical properties of the two PEN fibers were relatively improved by the high-speed melt spinning at higher spinning speeds. However, the initial modulus and tenacity of PEN fibers of high molecular weight decreased slightly at the take-up velocity of 7km/min.

Keywords

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