Direct measurement of the electrocaloric effect in poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer films - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Physics Letters Année : 2013

Direct measurement of the electrocaloric effect in poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer films

Résumé

We investigated the entropy change in poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) films in the temperature range between -5 degrees C and 60 degrees C by direct heat flux calorimetry using Peltier cell heat flux sensors. At the electric field E = 50 MVm(-1) the isothermal entropy change attains a maximum of vertical bar Delta s vertical bar = 4.2 Jkg(-1) K-1 at 31 degrees C with an adiabatic temperature change Delta T-ad = 1.1 K. At temperatures below the maximum, in the range from 25 degrees C to -5 degrees C, the entropy change vertical bar Delta s vertical bar rapidly decreases and the unipolar P vs E relationship becomes hysteretic. This phenomenon is interpreted as the fact that the fluctuations of the polar segments of the polymer chain, responsible for the electrocaloric effect ECE in the polymer, becomes progressively frozen below the relaxor transition.
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Dates et versions

hal-00925470 , version 1 (08-01-2014)

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Vittorio Basso, Florence Russo, Jean-François Gérard, Sébastien Pruvost. Direct measurement of the electrocaloric effect in poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer films. Applied Physics Letters, 2013, 103, pp.202904. ⟨10.1063/1.4830369⟩. ⟨hal-00925470⟩
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