Preparation and dielectric properties of CaCu3Ti4O12–polyethersulfone composites

CaCu3Ti4O12–polyethersulfone CCTO–PES composites with various CCTO volume fractions up to 0.5 were prepared. Relatively high dielectric constant   32.7 and low loss tan δ  0.063 of the composites with CCTO volume fraction at 0.5 were observed. Various theoretical models were employed to predict the dielectric constant of these composites, the dielectric constant obtained via EMT model were in close agreement with the experimental data. The dielectric constant of CCTO–PES composites showed weak frequency dependence at the measuring frequency range, and the loss tangent apparently decrease with increase in frequency. Both the dielectric constant and loss tangent showed weak temperature dependence at low temperature range from 20 to 60 °C, however, they increased dramatically with a further increase in temperature above 60 °C.