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(a) Temperature dependence of the real part of the dielectric permittivity (ɛ′) for the P(VDF-TrFE)/PMMA blends, for the indicated PMMA wt. %. (b) The reciprocal dielectric susceptibilities for the same samples, with the Curie-Weiss regions in the paraelectric phase (straight lines) starting at the indicated arrows.
(a) Electrical displacements as functions of the applied reversal field, in a polarization reversal cycle, for the P(VDF-TrFE)/PMMA blends with different degrees of crystallinity. (b) The corresponding field-induced reorientation rate of the electrical displacement for these polar materials.
(a) The ECE-induced isothermal entropy variations in the Curie-Weiss regime into the paraelectric region, for an estimated electric field of 130 MV/m, for blends with the indicated crystallinities. (b) The corresponding adiabatic temperature variations.
Calorimetric data for annealed P(VDF-TrFE)/PMMA blends, obtained from DSC heating runs. Specific weights, calculated by considering PMMA contents, and overall crystallinities were used to obtain specific entropies.
Calculated ECE entropy and temperature changes due to dipolar reorientation at 100 °C (into the paraelectric phase), for increasing sample crystallinity (ϕ).
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