Article
  • Effects of Melt Spinning Conditions and Post-Treatment on the Orientation and Crystallization of Polypropylene Hollow Fiber for Membranes
  • Jang TS, Kim JJ, Kwon YD, Kim UY
  • 용융방사조건과 후처리가 중공사막 제조용 플리프로필렌 중공사의 배향 및 결정화에 미치는 영향
  • 장태석, 김재진, 권영돈, 김은영
Abstract
The crystalline polypropylene hollow fibers were prepared by melt-spinning of polypropylene through a tube-in-orifice type nozzel and annealing process. Tensile strength, birefringence, density, and wide angle X-ray diffraction pattern of the hollow fibers were obtained for determining the effect of the preparation conditions such as draft ratio, spinning temperature, spinning speed, and annealing temperature on the degree of orientation and the crystallinity of the hollow fibers. The higher the draft ratio was, the more the orientation and the crystallinity increased. The hollow fiber spun at 190∼200℃ had higher degree of orientation than one spun at the higher temperature. After annealing process, the crystallinity was much increased while the degree of orientation was little changed. The hollow fiber membranes were made through drawing and heat treating the hollow fibers, and their performance was measured. The hollclw fiber membranes which had higher degree of orientation and higher crystallinity showed better performance. The scanning electron microscopy showed that the both sides of the hollow fiber membrane had the similar structure of pores and the pores had the shape of slit which was 0.3 μm long, and 0.1 μm wide.

폴리프로필렌을 tube-in-orifice형 노즐을 통해 용융방사한 후 아닐링처리하여 결정성 폴리프로필렌 중공사를 제조하였다. 이 때 드래프트비, 방사온도. 방사속도 빛 아닐링처리온도 등의 중공사 제조조건이 중공사의 배향도 및 결정화도에 미치는 영향을 조사하기 위하여 중공사의 인장강도. 복굴절율, 밀도. 광각 X선 측정을 실시하였다. 드래프트비가 증가할 수록 배향도와 결정화도가 중가하였으며, 190-200℃에서 방사한 중공사가 더 높은 온도에서 방사한 경우보다 배향도가 높았다. 아닐링처리 후에 배향도는 큰 변화가 없었으나 결정화도는 현저히 증가되었다. 중공사를 연신-열처리과정을 거쳐 중공사막을 만들고 막성능을 평가해 본 결과 배향도와 결정화도가 큰 중공사막의 기공크기와 다공도가 증가하였다. 생성되는 기공은 길이 0.3μm, 폭 0.1μm 정도의 슬릿 모양이며. 중공사의 내벽과 외벽의 구조가 거의 같았다.

Keywords:

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1991; 15(4): 395-401

    Published online Aug 25, 1991

  • 10.7317/pk.
  • Received on Nov 30, -0001
  • Revised on Nov 30, -0001
  • Accepted on Nov 30, -0001

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