Semicrystalline Ferroelectric Fluoropolymers and Process for Preparing Same

Abstract

A new class of ferroelectric terpolymers having an exceptionally large electrostrictive response (> 3%) induced by external electric field at ambient temperature comprise 50-80 mole % of vinylidene fluoride (VDF), 15-40 mole % of trifluoroethylene (TrFE) and 2-20 mole % of at least one bulky monomer, such as chlorotrifluoroethylene (CTFE) or hexafluoropropene (HFP). These semicrystalline terpolymers behave like a ferroelectric relaxor having a rapid electric field-induced mechanical response se, due to a low Curie temperature (phase transition between polar and nonpolar crystalline domains at or near ambient temperature) and high dielectric constant. A combination of bulk polymerization and free radical polymerization using oxidation adducts of an organoborane as the free radical initiator may be used to prepare the terpolymers, such that the terpolymers are characterized by good processibility, high purity and uniform molecular structure.

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Document Details

Document Type
Technical Report
Publication Date
Dec 05, 2000
Accession Number
ADD019990

Entities

People

  • Tze-chiang Chung

Organizations

  • United States Department of the Navy

Tags

Communities of Interest

  • Advanced Electronics
  • Biomedical

DTIC Thesaurus Topics

  • Alkenes
  • Biomedical And Dental Materials
  • Chemical Synthesis
  • Chemistry
  • Copolymers
  • Dielectric Permittivity
  • Fluoropolymers
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Organic Chemistry
  • Phase Transformations
  • Polymer Chemistry
  • Polymeric Films

Fields of Study

  • Chemistry

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology