Complex dielectric behavior of polyaniline at microwave and millimeter-wave frequencies

Leonard J. Buckley, Kenneth E. Dudeck

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A study of the complex dielectric properties at microwave and millimeter-wave frequencies on several polyanilines was performed. The polymers investigated were based on emeraldine salts. The chemically synthesized emeraldine base was protonated with acids of various pH levels. Aqueous HCl (pH range 0.12 to 1.07) and tosylic (pH range 0.22 to 1.13) acids were used. Complex permittivities of the emeraldine base and salts were determined at the X-band and R-band using waveguide measurements. Characterization techniques were developed to reduce the measurement error. This included the electrical determination of the sample holder length and sample position. The real component of the dielectric constant was found to vary from 4 to 131 at X-band and from 3.8 to 1910 at R-band. The dielectric loss spanned three orders of magnitude at X-band and four orders of magnitude at R-band. The frequency dependence was relatively level within each band with a slight decrease in each permittivity component with increasing frequency. The d.c. conductivity ranged from 10-4 to 10-1 S/cm for the emeraldine salts. The time dependence of the complex permittivity and d.c. conductivity was examined.

Original languageEnglish (US)
Pages (from-to)353-365
Number of pages13
JournalSynthetic Metals
Volume52
Issue number3
DOIs
StatePublished - Oct 15 1992

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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