Abstract
The dielectric behavior of composite materials (epoxy resin - barium titanate and epoxy - CCTO) was analysed as a function of ceramic amount. Composites were prepared by mixing the components and pouring them into suitable moulds. In some compositions, the matrix was reduced by tetrahydrofuran (THF) incorporation. Samples containing various amounts of ceramic filler were examined by TG/DTA and scanning electron microscopy analysis. Dielectric measurements were performed from 20 Hz to 1 MHz and 30 to 120 °C. It was demonstrated that the epoxy - CCTO composites possessed higher permittivity than classic epoxy - BaTiO3 composites. However, the low resin permittivity prevailed in the composite dielectric performance.
Highlights
In recent years, there has been an increasing interest on high dielectric constant flexible particulate composites made up of a ferroelectric ceramic and a polymer for high density energy storage and capacitor applications[1]
The difference between the experimental and theoretical density values is fundamentally due to the presence of pores into the composite, which are produced during the mixing process when air flow is restricted due to the high viscosity of the system
Real permittivity was influenced by filler volume fraction
Summary
There has been an increasing interest on high dielectric constant flexible particulate composites made up of a ferroelectric ceramic and a polymer for high density energy storage and capacitor applications[1]. In BaTiO3/epoxy composites, though BaTiO3 has relatively high dielectric constant (>1000), the effective dielectric constant (εeff) of the composite was as low as 50, even when the highest possible volume fraction of ceramics was incorporated[2]. A number of theoretical studies and experimental observations has attempted to elucidate the remarkable (ultra high) dielectric properties of CCTO perovskite-like material. These materials have demonstrated to have a dielectric constant as high as 50,000. Relaxation phenomena as a function of frequency, temperature, and filler volume fraction were analysed
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