IntroductionPolymer‐based composites with embedded solid fillers can incorporate mechanical and electrical properties of its constituents. The ferroelectric polymer poly(vinylidene fluoride) (PVDF) and its copolymers with trifluoroethylene P(VDF‐TrFE) are perfect materials offering good mechanical compliance, relatively good dielectric and piezoelectric properties among other polymers. Incorporation of these properties is necessary in various devices starting from miniature capacitors for telecommunication high performance actuators or contact switches. However, these polymers also distinguish above other ferroelectric materials by its negative piezoelectricity, i.e., a contraction of the material upon an electric field in the direction of the polarization. Katsouras et al. proposed a new model in addition to the previous contradictory models, in which the unusual negative piezoelectric coefficient is explained by electromechanically coupled contractions of crystalline lamellae and amorphous parts. Therefore, figuring out a single model for improvement of electromechanical properties of PVDF and P(VDF‐TrFE)‐based composites is complicated by the opposite signs of piezoelectric coefficients of the polymer matrix with regard to the coefficients of ceramic fillers. Nevertheless, further efforts to improve piezoelectric and dielectric properties of the polymers have been done by mixing these ferroelectric copolymers with electroactive fillers. Fillers of the well‐known piezoelectrics, such as barium‐doped lead zirconate titanate (BPZT) or
Physica Status Solidi (B) Basic Solid State Physics – Wiley
Published: Jan 1, 2018
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