Structural and ferroelectric response in vinylidene fluoride/trifluoroethylene/hexafluoropropylene terpolymers

Haisheng Xu, Dong Shen, Qiming Zhang

    Research output: Contribution to journalArticle

    38 Scopus citations

    Abstract

    Poly(vinylidene fluoride/trifluoroethylene/hexafluoropropylene) terpolymers were synthesized by bulk polymerization process at ambient temperature based on alkyl borane/oxygen initiator. The ferroelectric and dielectric properties were investigated and compared with those of poly(vinylidene fluoride/trifluoroethylene) copolymer. The DSC, X-ray and FT-IR results suggest that the third comonomer in the polymer chain breaks the large polar domains into smaller domain size and reduces the crystallinity of terpolymer. As a result, both the ferroelectric-paraelectric phase transition and melting process take place at lower temperature. The smaller domain makes the dipoles reversal at lower electric field and reduces the polarization hysteresis as well as polarization level. High electrostrictive strain (2.5%) was obtained at low electric field for terpolymer with small quantity of HFP. The polarization and dielectric behaviors imply that the terpolymer is a typical ferroelectric relaxor. The terpolymer also shows higher room temperature dielectric constant than that of copolymer due to the lower phase-transition temperature.

    Original languageEnglish (US)
    Pages (from-to)2124-2129
    Number of pages6
    JournalPolymer
    Volume48
    Issue number7
    DOIs
    StatePublished - Mar 23 2007

    All Science Journal Classification (ASJC) codes

    • Organic Chemistry
    • Polymers and Plastics
    • Materials Chemistry

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