Crystalline properties dependence of dielectric and energy storage properties of poly(vinylidene fluoride-chlorotrifluoroethylene)

Thermal quenching at various temperatures has been employed to fabricate poly(vinylidene fluoride-co-chlorotrifluoroethylene) films with varied crystalline properties in an attempt to significantly improve their dielectric and energy storage properties. It has been shown that the film quenched at lower temperature possesses lower crystallinity and crystal grain size. The dielectric constant and dielectric loss of corresponding films are improved at low frequency and reduced at high frequency due to the response of dipoles in amorphous phase. The breakdown strength and polarization of the film quenched at lower temperature are larger than that quenched at higher temperature. Therefore, the low quenching temperature favors the high energy density both under the consistent electric field and the breakdown electric field.