Enhanced dielectric constant of polymer-matrix composites using nano-BaTiO3 agglomerates
- Enhanced dielectric constant of polymer-matrix composites using nano-BaTiO3 agglomerates
- 이동호; 이종흔; 김동완; 김병국; 제해준
- ceramic-polymer composites; dielectric constant; addlomeration effect; mixing model; parallel arrangement
- Issue Date
- Journal of the Ceramic Society of Japan
- VOL 118, NO 1, 62-65
- 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.
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