Enhanced dielectric constant of polymer-matrix compositesusing nano-BaTiO3 agglomerates

Dong Ho Lee, Jong Heun Lee, Dong-Wan Kim, Byung Kook Kim, Hae June Je

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The epoxy/matrix composites incorporating with dispersed and agglomerated nano-BaTiO3 fillers were investigated. The relative dielectric constants of the composites with the agglomerated particles were significantly improved, compared to those of the composites with the well-dispersed particles. In addition, the experimental data were in better agreement with the values calculated by the Lichteneker's model than with those of the conventional Maxwell-Garnett's model which has been widely employed for the calculation of the dielectric constant of polymer/filler composites. In order to promote an agglomeration by interlocking between the nanoparticles, the BaTiO3 powders were heat-treated at various temperatures. An epoxy composite with 40 vol% BaTiO3 heat-treated at 800°C for 1 h exhibited an excellent relative dielectric constant of 67, along with high polarizability, low dielectric loss, and low leakage current. Similarly, the epoxy composites with agglomerated SrTiO3 fillers provided a higher dielectric constant than that of their dispersed counterparts. The origin of the increase in the relative dielectric constant achieved by the agglomeration effect is also suggested.

Original languageEnglish
Pages (from-to)62-65
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume118
Issue number1373
DOIs
Publication statusPublished - 2010 Jan

Keywords

  • Agglomeration effect
  • Ceramic-polymer composites
  • Dielectric constant
  • Mixing model
  • Parallel arrangement

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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