Frequency dispersion characteristics of the complex permittivity of the epoxy-carbon black composites

Hyung Do Choi, Kwang Yun Cho, Seung Han, Ho Gyu Yoon, Tak Jin Moon

Research output: Contribution to journalArticle

Abstract

The effects of frequency, volume fraction of carbon black, and porosity on the complex permittivity of the epoxy-carbon black composites were investigated and the frequency dispersion behavior model for the complex permittivity was proposed. In the epoxy-carboo black composites, the frequency dispersion behaviors of the complex permittivity changed from relaxation spectrum to resonance spectrum with increasing the amount of carbon black. The complex permittivity of the composites increased with decreasing the porosity. Comparing the complex permittivity of the composites filled with 2 vol % of carbon black with the values obtained from three types of previously reported model equations, the relaxation behavior coincided with the Havriliak-Negami model. The damping and asymmetrical factor values were increased with increasing porosity in the composites. The empirical equation proposed here was useful in describing the complex permittivity of the composites of > 3 vol % carbon black with resonance type. The damping factor (γ) decreased as the filler content increased, but the asymmetrical factor (κ) increased reversely.

Original languageEnglish
Pages (from-to)363-369
Number of pages7
JournalJournal of Applied Polymer Science
Volume67
Issue number2
DOIs
Publication statusPublished - 1998 Jan 10

Keywords

  • Complex permittivity
  • Composite
  • Frequency dispersion behavior

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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