Abstract
Abstract Dielectric properties of composite materials, polymer - ferroelectric filler, were investigated in wide frequency and temperature ranges. It has been shown that dielectric properties of polymer composites are a function of the size and concentration of ferroelectric filler particles, since these particles contain a defective outer surface layer with dielectric properties significantly different from those of the ferroelectric bulk. Dielectric properties of composites were found to depend on the type and properties of the polymer matrix, as well as on the method and conditions of composite preparation. Composites cured in the measurement cell possess a more porous structure, their dielectric constant ε' being lower compared to compression molded samples. ε' of polypropylene composites in the ferroelectric phase is higher than that of epoxy resin composites.
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