Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Effects of dissolution temperature on the rheological properties of polyvinyl alchol solutions in dimethyl sulfoxide

  • Cho, Yong-Han (Division of Applied Chemical Engineering, Hanyang University) ;
  • Dan, Kyung-Sik (Division of Applied Chemical Engineering, Hanyang University) ;
  • Kim, Byoung-Chul (Division of Applied Chemical Engineering, Hanyang University)
  • Published : 2008.06.30
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Abstract

The rheological properties of polar solutions are very sensitive to preparative methods as well as measuring conditions. The effects of dissolution temperature on the rheological properties of the solutions of polyvinyl alcohol (PVA) in dimethyl sulfoxide were investigated over the range of dissolution temperatures $70-130^{\circ}C$. Viscosity was increased as dissolution temperature was increased. PVA solutions prepared at 120 and $130^{\circ}C$ showed Bingham behavior, which became less noticeable with decreasing dissolution temperature. The modified Cole-Cole plot of the solutions gave slope less than 2, suggesting the solutions were a heterogeneous system irrespective of optical transparency. Further, the slope was decreased with increasing dissolution temperature, indicating that the solid character got more prominent as dissolution temperature was increased. However, the relaxation time of the solutions was little dependent on dissolution temperature.

Keywords

References

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