Effect of high energy electron irradiation on the electromechanical properties of poly(vinylidene fluoride-trifluorethylene) 50/50 and 65/35 copolymers

    Authors

    Z. Y. Cheng; V. Bharti; T. Mai; T. B. Xu; Q. M. Zhang; T. Ramotowski; K. A. Wright;R. Ting

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Ultrason. Ferroelectr. Freq. Control

    Keywords

    FIELD-INDUCED STRAIN; FLUORIDE-TRIFLUOROETHYLENE) COPOLYMER; POLYURETHANE ELASTOMER; ELECTROSTRICTION; RESPONSES; DILATOMETER; BEHAVIOR; FILMS; Acoustics; Engineering, Electrical & Electronic

    Abstract

    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.

    Journal Title

    Ieee Transactions on Ultrasonics Ferroelectrics and Frequency Control

    Volume

    47

    Issue/Number

    6

    Publication Date

    1-1-2000

    Document Type

    Article

    Language

    English

    First Page

    1296

    Last Page

    1307

    WOS Identifier

    WOS:000165172200005

    ISSN

    0885-3010

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