The electrorheological and dielectric behaviors of conducting polymer-coated poly(ethyl methacrylate) suspensions

Young Dae Kim, Dong Hyup Park, Suk Woo Nam, Tae Jin Park

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The electrorheological (ER) and dielectric behaviors of the polypyrrole(PPy)-coated poly(ethyl methacrylate)(PEMA) suspensions in mineral oil were investigated. PPy was coated on PEMA particles to enhance the particle polarization, which would lead to the enhanced ER response. Various PPy-coated PEMA particles were synthesized by controlling the oxidant amount during the pyrrole polymerization, and the ER responses of their suspensions were investigated. The ER response initially increases with the oxidant amount, passes through a maximum, and then decreases with the oxidant amount. The initial increase in the ER response with oxidant amounts is due to the enhanced particle polarization with the increased particle surface conductivity. The dielectric properties of the corresponding suspensions support that the ER enhancement arises from the enhanced particle polarization. The decrease in the ER response at large oxidant amounts seems to arise from the increased conduction between the PPy-coated PEMA particles.

Original languageEnglish
Pages (from-to)215-220
Number of pages6
JournalMacromolecular Research
Volume10
Issue number4
DOIs
Publication statusPublished - 2002 Aug

Keywords

  • Conducting polymer-coated particle
  • Electrorheology
  • Polypyrrole
  • Suspension

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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