High piezoelectric responses in P(VDF-HFP) copolymers for sensors and transducers

Yong Wang, Bret Neese, Qiming Zhang, Cheng Huang, James West

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Scopus citations

    Abstract

    Piezopolymers with high piezoelectric responses are highly desirable for a broad range of sensor, actuator and transducer applications. Defects modification concept applied on PVDF yields a high transverse piezoelectric response with both high piezoelectric d31 (d31=43.1pm/V) and electromechanical coupling k31 coefficients (k 31=0.187) in poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] 10wt% copolymers under quasi-static condition, much higher than these in the piezoelectric poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymers. High frequency electromechanical resonance measurement was carried out under both LE mode and TE mode. Frequency dispersion of the piezoelectric response results in a smaller d31 (=20.5pm/V) at 5OkHz. Thickness resonance measurement gives kt=0.14 at 60MHz, which demonstrates it can be used as high frequency (>50MHz) ultrasonic transducers. Furthermore, the copolymers also display a higher d31 coefficient compared to the d33 coefficient, which seems to be unusual compared with most other piezopolymers. The experimental data suggests that the origin of the unusual piezoelectric response in these P(VDF-HFP) copolymers originates from a reversible change between a poled a-like structure and ß-like structure.

    Original languageEnglish (US)
    Title of host publication2007 IEEE Ultrasonics Symposium Proceedings, IUS
    Pages2606-2630
    Number of pages25
    DOIs
    StatePublished - Dec 1 2007
    Event2007 IEEE Ultrasonics Symposium, IUS - New York, NY, United States
    Duration: Oct 28 2007Oct 31 2007

    Publication series

    NameProceedings - IEEE Ultrasonics Symposium
    ISSN (Print)1051-0117

    Other

    Other2007 IEEE Ultrasonics Symposium, IUS
    CountryUnited States
    CityNew York, NY
    Period10/28/0710/31/07

    All Science Journal Classification (ASJC) codes

    • Acoustics and Ultrasonics

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