Accession Number : ADA307921

Title :   Ferroelectric and Piezoelectric Properties of a Quenched Poly(Vinylidene Fluoride-Trifluoroethylene) Copolymer.

Descriptive Note : Technical rept.,

Corporate Author : RUTGERS - THE STATE UNIV NEW BRUNSWICK NJ DEPT OF CHEMICAL AND BIOCHEMICAL E NGINEERING

Personal Author(s) : Christie, M. C. ; Scheinbeim, J. I. ; Newman, B. A.

PDF Url : ADA307921

Report Date : APR 1996

Pagination or Media Count : 23

Abstract : The ferroelectric and piezoelectric properties of melt-quenched unoriented poly(vinylidene fluoride-trifluoroethylene) (73:27) copolymer films as a function of the number of poling cycles have been studied. The investigation revealed that quenched films exhibit a decrease in D-E hysteresis behavior as the number of poling cycles increases when the samples are poled at room temperature. Corresponding decreases in remanent polarization, Pr, as well as small increases in the coercive field, Ec, were observed as the material was subjected to successive poling cycles. The piezoelectric coefficients, d31 and e31, also decreased as the number of poling cycles increased. In addition, a clear reduction in the 'apparent' Curie transition temperature between unpoled and poled material was observed. Preliminary evidence indicates that films quenched below Tc do not form a stable ferroelectric crystal phase as previously believed.

Descriptors :   *QUENCHING, *FLUORIDES, *FERROELECTRIC MATERIALS, *PIEZOELECTRIC EFFECT, *POLYVINYLIDENES, POLARIZATION, STABILITY, BLOCK COPOLYMERS, FILMS, CRYSTALS, ROOM TEMPERATURE, REDUCTION, COEFFICIENTS, PIEZOELECTRICITY, POLYMERIC FILMS, COERCIVE FORCE, FERROELECTRICITY.

Subject Categories : Polymer Chemistry
      Inorganic Chemistry
      Organic Chemistry
      Coatings, Colorants and Finishes
      Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE