Effect of electron irradiation on poly(vinylidene fluoride-trifluoroethylene) copolymers

Effect of electron irradiation on poly„vinylidene fluoride-trifluoroethylene... copolymers

Electrical field-induced strain response of electron-irradiated poly~vinylidene fluoride-trifluoroethylene! copolymer has been studied by a Mach–Zehnder type heterodyne interferometer in the frequency range of 3–9 kHz. The electrostrictive constant is calculated from the strain results, which is of the same order of magnitude as those obtained at 1 Hz by a bimorph-based strain sensor but at muc...

Polyvinylidene fluoride–trifluoroethylene as a reservoir for absorbed water

The absorption of water in Langmuir–Blodgett fi lms of ferroelectric copolymers of polyvinylidene fl uoride with trifl uoroethylene is shown to depend upon the fi lm thickness. This water absorption can have a profound effect on the dielectric properties of the copolymer fi lms.

Ferroelectric transitions and relaxation processes of vinylidene fluoride/trifluoroethylene copolymers

2014 Thermally Stimulated Depolarization (TSD) measurements with a superimposed piezoelectric noise allowed us to identify the ferroelectric-to-paraelectric phase transition in vinylidene fluoride/trifluoroethylene (VDF/TrFE) copolymers, with different molar ratios. A second peak was also detected in TSD measurements which maintain the ferroelectric features of the material. Long relaxation pro...

Structural evolution and dielectric relaxation behavior of electron-irradiated poly„vinylidene fluoride–trifluoroethylene... 80Õ20 mol% copolymers

The effect of high-energy electron irradiation on poly~vinylidene fluoride-trifluoroethylene! 80/20 mol % copolymers has been studied in a broad dose ranging from 0 to 120 Mrad. It was found that the copolymers transformed from a normal ferroelectric to a relaxor ferroelectric phase ~RFE! at high electron doses. For copolymers irradiated at the dose above 90 Mrad, they exhibited typical dielect...

Effects of an external electric field on the ferroelectric-paraelectric phase transition in polyvinylidene fluoride-trifluoroethylene copolymer Langmuir-Blodgett films