Rheological Behaviors of Mesophase Pitches Prepared from Coal Tar Pitch as Carbon Fiber Precursor

탄소섬유 원재료로서 콜타르로부터 제조된 메조페이스 핏치의 유변학적 거동

  • Lee, Young-Seak (Department of Chemical Engineering, College of Engineering, Sunchon National University) ;
  • Kim, Tae-Jin (Ssangyong Research Center)
  • 이영석 (순천대학교 공과대학 화학공학과) ;
  • 김태진 (쌍용중앙연구소)
  • Received : 1999.01.25
  • Accepted : 1999.06.05
  • Published : 1999.08.10

Abstract

An experimental study for mesophase pitch prepared from coal tar pitch has been carried out to clarify the rheological behaviors in the molten state. The apparent viscosity, shear stress, shear rate, Qunoline insoluble(QI), and softening point(SP) change were investigated especially. The conditions to increase mesophase content during polymerization were heat treatment time of 5 hrs, catalyst concentration of 3% and reaction temperature of $420^{\circ}C$. Apparent viscosity change with increase in temperature of pitches was different according to the heat treatment conditions and apparent viscosity increased with increasing heat treatment temperature, heat treatment time, contents of mesophase, on the contrary, fluidity is decreased. Rheological behavior of molten mesophase pitches at about $270^{\circ}C$ showed Newtonian behavior below $375^{\circ}C$ and non-Newtonian behavior above $270^{\circ}C$, the flow behavior was analyzed with Casson model.

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