The rheological properties of poly(vinylidene fluoride-co- hexafluoropropylene) solutions in dimethyl acetamide

Ki Hyun Lee, In Kyu Song, Byoung Chul Kim

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The effects of temperature on the rheological properties of the solutions of poly(vinylidene fluoride-co-hexafluopropylene) (PVDF-HFP) in dimethyl acetamide (DMAc) were investigated in terms of frequency and concentration. The effects of temperature on the intrinsic viscosity of the solutions were discussed. In dynamic rheological measurement, the concentrated solutions showed a little unexpected rheological response; as temperature was increased dynamic viscosity was increased and the solutions exhibited more noticeable Bingham body character over the temperature range, 30 to 70°C. In addition, the solution gave longer relaxation time, lower value of loss tangent and higher value of yield stress at higher temperature and at higher concentration. On the other hand, the dilute solutions revealed that intrinsic viscosity was decreased and its Huggins constant was increased with increasing temperature. These physical parameters suggested that the increase of viscosity with increasing temperature resulted from the localized gelation of PVDF-HFP due to reduced solubility to the solvent.

Original languageEnglish
Pages (from-to)213-220
Number of pages8
JournalKorea Australia Rheology Journal
Volume20
Issue number4
StatePublished - 2008 Dec 1

Keywords

  • Dimethyl acetamide
  • Intrinsic viscosity
  • Poly(vinylidene fluoride-co-hexafluoropropylene)
  • Solution
  • Theological properties

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