High Pressure Studies of Hydrated Nafion Membranes: Dielectric Relaxation and Deuteron NMR

Abstract

Audio frequency electrical conductivity/dielectric relaxation and nuclear magnetic resonance studies of Nafion-117 have been carried out at pressures up to 0.3 GPa (3 kbar). For some samples, the electrical conductivity exhibits dispersion typical of hopping conductivity in an amorphous material, sigma=sigma o omega m. The values of m are sample dependent and vary from about 0.55 to 0.75. In addition, the values of m are not strongly pressure sensitive. At a given frequency, the electrical conductivity tends to decrease as pressure increases and yield activation volumes on the order of 5 to 10 cu. cm/mol. The activation volume determined from the NMR spin-lattice relaxation time measurements are also sample dependent. The data shown correspond to an activation volume of about 8.6 cu.cm/mol.

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Document Details

Document Type
Technical Report
Publication Date
Apr 16, 1993
Accession Number
ADA263511

Entities

People

  • J. P. Jayakody
  • John J. Fontanella
  • M. C. Wintersgill
  • M. G. Mclin
  • R. S. Chen
  • S. G. Greenbaum

Organizations

  • United States Naval Academy

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Amorphous Materials
  • Barometric Pressure
  • Deuterons
  • Dielectric Permittivity
  • Electrical Conductivity
  • Electrical Properties
  • Frequency
  • High Pressure
  • Macromolecules
  • Magnetic Resonance
  • Measurement
  • Military Research
  • New York
  • Nuclear Magnetic Resonance
  • Polymers
  • United States
  • United States Naval Academy

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.