Evolution of property and microstructure of p(VDF-TrFE) copolymers modified by irradiation introduced defects

Z. Y. Cheng, Zhimin Li, Yanyun Ma, Qiming Zhang, Fred B. Bateman

    Research output: Contribution to journalConference article

    1 Scopus citations

    Abstract

    The effect of defects introduced by high-energy electron irradiation on microstructure and properties in poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] is reported. In studies of the copolymers, it is found that as defect concentration increases, the material can be changed from a normal ferroelectrics to a relaxor ferroelectrics (RFE) and then to a simple relaxor. Correspondingly, the crystalline morphology changes from a coexistence of polar and non-polar phases to a macroscopically uniform non-polar phase, as revealed by x -ray data. It was observed that the dielectric property in the copolymers with a different amount of defects was well described by the Vogel-Fulcher (V-F) relationship. Based on the experimental data, a critical size, which is the smallest size of crystal with ferroelectric phase, of about 5 nm was obtained for the copolymer. The RFE developed here exhibits a massive electrostrictive strain which is very attractive for many actuator and transducer applications and a high dielectric constant which is attractive for development of high-density energy storage capacitors and electronic packaging.

    Original languageEnglish (US)
    Pages (from-to)403-414
    Number of pages12
    JournalMaterials Research Society Symposium - Proceedings
    Volume734
    StatePublished - Jun 30 2003
    EventPolymer/Metal Interfaces and Defect Mediated Phenomena in Ordered Polymers - Boston, MA, United States
    Duration: Dec 2 2002Dec 6 2002

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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