Accession Number : ADA132896

Title :   Pre-Existing Polarization and Influence of Electrode Materials on PVF2 Electrets as Determined by Thermal Pulse and Pyroelectric Methods.

Descriptive Note : Technical rept.,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON DC POLYMER SCIENCE AND STANDARDS DIV

Personal Author(s) : DeReggi,Aime S ; Mopsik,Frederick I ; Broadhurst,Martin G ; Lang,Sidney B

PDF Url : ADA132896

Report Date : Aug 1983

Pagination or Media Count : 24

Abstract : A number of polyvinylidene fluoride (PVF2) electrets were prepared with different permutations of gold and aluminum electrodes and poled with DC fields up to 160 MV per m at room temperature. Polarization distributions were measured by the thermal pulse method and pyroelectric coefficients were determined. Quantitative measurements were made of a significant level of polarization in nominally unpoled PVF2 and a contact electrification mechanism was proposed. No consistent effects of electrode materials on polarization distribution were found. PVF2 poled at room temperature has its highest polarization near the center of the thickness in contrast to the results on samples poled at elevated temperatures and cooled inhomogeneously with the field applied. (Author)

Descriptors :   *Polyvinylidenes, *Electrets, *Polarization, *Piezoelectric materials, *Electrodes, *Pyroelectricity, Gold, Aluminum, Thermal radiation, Magnetic fields, Room temperature, Fluorides, Measurement, High temperature, Coefficients, Pulses, Materials, Permutations, Thickness, Distribution, Homogeneity, Consistency

Subject Categories : Plastics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE