Ferroelectric VDF/TrFE/CTFE terpolymers; Synthesis and electric properties

Tze-chiang Chung, A. Petchsuk

Research output: Contribution to journalConference article

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Abstract

This paper discusses a new ferroelectric polymer with high dielectric constant (≥50 at 1K-1M Hz) and large electrostrictive response (∼5%) at ambient temperature, which is based on a processable semicrystalline terpolymer comprising vinylidene difluoride (VDF), trifluoroethylene (TrFE), and chlorotrifluoroethylene (CTFE). This VDF/TrFE/CTFE terpolymer was prepared by a combination of a borane/oxygen initiator and bulk polymerization process at ambient temperature. The control of monomer addition afforts the terpolymers with high molecular weight and relatively narrow molecular weight and composition distributions. The incorporated bulky CTFE units homogeneously distributed along the polymer chain seem to reduce the thickness of ferroelectric crystalline domains without destroying the overall crystallinity. This nano-size semicrystalline morphology results in the reduction of ferroelectric-paraelectric (F-P) phase transition to near ambient temperature with a very small energy barrier. Some terpolymers exhibited common ferroelectric relaxor behaviors with a broad dielectric peak that shifted toward higher temperatures as the frequency increased, and a slim polarization hysteresis loop at near the dielectric peak (around ambient temperature) that gradually evolved into a normal ferroelectric polarization hysteresis loop with reduced temperature.

Original languageEnglish (US)
Pages (from-to)117-124
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4329
DOIs
StatePublished - Jan 1 2001
EventElectroactive Polymer, Actuators and Devices-Smart Structures and Materials 2001- - Newport Beach, CA, United States
Duration: Mar 5 2001Mar 8 2001

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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