Luminescence Probe Studies of Ionomers. I. Steady-State Measurements from Nafion Membrane.

Abstract

Steady state luminescence probe methods were used to study the polarity of the ionic cluster phase within Nafion 117 membrane. Three probes, pyrene, a cationic dansyl derivative and Ru(bpy)3(2+) were used. In fully hydrated Nafion membranes (ca. 40% water by weight), these probes report back microenvironment polarities significantly lower than bulk water. In addition, these probes show that the -SO3H sites are chemically heterogeneous. The effects of water content and counterion on cluster phase polarity were also evaluated. The cluster phase can become quite nonpolar when water is removed and/or when a hydrophobic counterion is added. The effects of the Nafion chemical environment on the dynamics and thermodynamics of chemical processes occurring within the polymer are discussed and demonstrated. Originator supplied keywords include: Ion exchange membranes; Luminescence probe studies; Nafion.

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Document Details

Document Type
Technical Report
Publication Date
Feb 03, 1985
Accession Number
ADA152475

Entities

People

  • C. R. Martin
  • M. N. Szentirmay
  • N. E. Prieto

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alcohols
  • Chemical Compounds
  • Chemical Synthesis
  • Chemistry
  • Dynamics
  • Electrolytes
  • Emission Spectra
  • Energy
  • Macromolecules
  • Military Research
  • Organic Chemistry
  • Physical Chemistry
  • Polyelectrolytes
  • Polymeric Films
  • Polymers
  • Steady State
  • Thermodynamics

Readers

  • Plasma Physics.
  • Polymer Science and Technology