Fabrication of BaTiO₃/Epoxy Composites Exhibiting Large Dielectric Constant, Low Dielectric Loss and High Flexural Strength

Abstract

BaTiO₃/epoxy composites consisting of two three-dimensionally interpenetrating networks of BaTiO₃ and epoxy phases were prepared using a new approach. The BaTiO₃/epoxy composites exhibit a colossal dielectric constant, low dielectric loss and high flexural strength. In the BaTiO₃ networks, chemically bonded grain boundaries between neighboring BaTiO₃ grains were established, and they are responsible for the colossal dielectric constant and high flexural strength of the BaTiO₃/epoxy composites. Furthermore, unlike the conventional ceramic/polymer composites, this approach also makes high loadings of BaTiO₃ contents possible for the BaTiO₃/epoxy composites without compromising their high flexural strength.

Keywords

ceramic/polymer composite / BaTiO₃/epoxy / dielectric property / colossal dielectric constant

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