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Electrocaloric effect in low-crystallinity ferroelectric polymers
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Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(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.


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Table I.

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.

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Table II.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electrocaloric effect in low-crystallinity ferroelectric polymers