Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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The Rheological Properties of the Solutions of PVDF in DMAc for Electrospinning

전기방사용 PVDF/DMAc 용액계의 유변학적 특성

  • Ji Byoung Hwa (Division of Applied Chemical Engineering, Hanyang University) ;
  • Kim Byoung Chul (Division of Applied Chemical Engineering, Hanyang University)
  • 지병화 (한양대학교 응용화학공학부 고분자 구조제어 연구실) ;
  • 김병철 (한양대학교 응용화학공학부 고분자 구조제어 연구실)
  • Published : 2004.12.01
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Abstract

The solutions of polyvinylidene fluoride (PVDF) in dimethyl acetamide (DMAc) were rheologically investigated. In the dilute concentration regime, the solutions gave values of Huggins constant lower than 0.52, which decreased with increasing temperature. This suggests that DMAc is a good solvent and the solvating power is increased with increasing temperature. The solutions exhibited an inflection point on the log-log plot of $\eta_{sp}$ versus $(\eta)C$. Further, the slope was slightly decreased with increasing temperature from 10 to $30^{\circ}C$. At high concentrations, the solutions did not show lower Newtonian flow region. Further, raising temperature from 10 to $30^{\circ}C$ increased viscosity and yield stress of the solutions. Increasing concentration had the same effect on the rheological properties as increasing temperature. Relaxation time $(\lambda) $ increased as the concentration and temperature increased.

Keywords

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