Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

Rheological Investigations of Mesophase/Isotropic Pitch Blends for Fiber Spinning

메조페이스/등방성 핏치의 방사성 판단을 위한 점탄성거동

  • Kim, Yong-Joong (RIST) ;
  • Kim, Bo-Hye (Department of Polymer & Fiber System Engineering and Alan G. MacDiarmid Energy Research Institute (AMERI), Chonnam National University) ;
  • Lee, Dong-Hun (Department of Polymer & Fiber System Engineering and Alan G. MacDiarmid Energy Research Institute (AMERI), Chonnam National University) ;
  • Kim, Chang-Hyo (Department of Polymer & Fiber System Engineering and Alan G. MacDiarmid Energy Research Institute (AMERI), Chonnam National University) ;
  • Yang, Kap-Seung (Department of Polymer & Fiber System Engineering and Alan G. MacDiarmid Energy Research Institute (AMERI), Chonnam National University) ;
  • Lee, Woong-Eui (Kwangju Women's University)
  • 김용중 (포항산업과학연구원) ;
  • 김보혜 (전남대학교 고분자/섬유시스템공학과, AMERI 연구소) ;
  • 이동훈 (전남대학교 고분자/섬유시스템공학과, AMERI 연구소) ;
  • 김창효 (전남대학교 고분자/섬유시스템공학과, AMERI 연구소) ;
  • 양갑승 (전남대학교 고분자/섬유시스템공학과, AMERI 연구소) ;
  • 이웅의 (광주여자대학교)
  • Received : 2010.06.17
  • Accepted : 2010.08.10
  • Published : 2010.08.31
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Abstract

The rheological behavior of mesophase and isotropic pitch blends were examined using capillary and coneplate viscometers to determine the spinnability. The mesophase synthesized from naphthalene and coal tar pitch modified with benzoquinone were used. The individual component of the mesophase pitch or the isotropic phase pitch showed excellent spinnability but the spinnability of the blends decreased as the composition approached 50 wt.%. The variations of the spinnability were explained based on the mechanisms of capillary break-up and cohesive brittle fracture. The fracture of the spin line was caused mainly by capillary break-up originating from the high interfacial tension between the two separated phases; the behavior was more severe in the lower shear rate region, i.e. the elasticity dominant area. The spinnability of the two phase blends could be improved by maintaining the melts under the viscosity dominant condition by adjusting the shear rate and temperature.

Keywords

Acknowledgement

Supported by : 한국연구재단

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