Effect of high energy electron irradiation on the electromechanical properties of poly(vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers
Abbreviated Journal Title
IEEE Trans. Ultrason. Ferroelectr. Freq. Control
FIELD-INDUCED STRAIN; FLUORIDE-TRIFLUOROETHYLENE) COPOLYMER; POLYURETHANE ELASTOMER; ELECTROSTRICTION; RESPONSES; DILATOMETER; BEHAVIOR; FILMS; Acoustics; Engineering, Electrical & Electronic
High energy electron irradiation with a broad range dosage was carried out on poly(vinylidene fluoride-trifluorethylene) copolymer 65/35 mol% and 50/50 mol% films at different temperatures from room temperature to a temperature close to the melt temperature. The effect of irradiation on the properties of the Alms, such as electric field-induced strain, dielectric and polarisation behaviors, and mechanical modulus, is presented. The irradiated films can exhibit a very large electric field-induced strain, more than 4.5% longitudinal strain, and 3% transverse strain. The transverse strain of the stretched film can compare with the longitudinal strain; that of the unstretched film is much smaller than the longitudinal strain. With regard to the dielectric and polarization behaviors, we found that irradiation changes the copolymer from a typical ferroelectric to a relaxer ferroelectric in which the behavior of microregions under the electric field plays the key role. Between the two copolymers studied, we found that 65/35 copolymer is preferred for both longitudinal and transverse strain generation. A model is proposed to explain the experimental results that the amplitude of the charge electrostrictive coefficient (Q) increases with decreasing crystallinity.
Ieee Transactions on Ultrasonics Ferroelectrics and Frequency Control
"Effect of high energy electron irradiation on the electromechanical properties of poly(vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers" (2000). Faculty Bibliography 2000s. 2464.