Enhanced dielectric constant of polymer-matrix composites using nano-BaTiO3 agglomerates

Title
Enhanced dielectric constant of polymer-matrix composites using nano-BaTiO3 agglomerates
Authors
이동호이종흔김동완김병국제해준
Keywords
ceramic-polymer composites; dielectric constant; addlomeration effect; mixing model; parallel arrangement
Issue Date
2010-01
Publisher
Journal of the Ceramic Society of Japan
Citation
VOL 118, NO 1, 62-65
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.
URI
http://pubs.kist.re.kr/handle/201004/37090
ISSN
1882-0743
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KIST Publication > Article
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