Accession Number:

ADA229185

Title:

OCM and Impedance Analysis of Polypyrrole

Descriptive Note:

Technical rept. 1 Jan 1989-1 May 1990

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS CORROSION RESEARCH CENTER

Report Date:

1990-05-01

Pagination or Media Count:

4.0

Abstract:

Quartz crystal microbalance studies have been used to identify anion insertion or cation insertion in polypyrrole films. In the conditions where only a single species is inserted, impedance measurements have been used to characterized the processes of charge injection and diffusion in the films. Impedance behavior of electroactive polymer films display three distinct regions, characterized by different relaxation times. At high frequencies, the simultaneous injection of holes during oxidation of the polymer and counterion movement to maintain charge neutrality is the rate controlling process. At intermediate frequencies, diffusion of holes and ions in the film is rate limiting. At the lowest frequencies, the finite thickness of the film causes the impedance to become purely capacitive redox capacity region. Keywords Polymer, Impedance polypyrrole, Insertion electrode.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE