Accession Number:

ADA199455

Title:

NMR (Na Nuclear Magnetic Resonance) Studies of Na+-Anion Association Effects in Polymer Electrolytes

Descriptive Note:

Interim rept.

Corporate Author:

HUNTER COLL NEW YORK DEPT OF PHYSICS AND ASTRONOMY

Report Date:

1988-08-23

Pagination or Media Count:

21.0

Abstract:

23Na nuclear magnetic resonance NMR measurements on polypropylene oxide PPO and siloxane based polymer electrolytes containing various sodium salts at a single nominal concentration are reported. In addition, differential scanning calorimetry DSC and electrical conductivity studies were carried out on the PPO materials. The NMR-determined mobile Na concentrations and DSC results provide evidence for ionic aggregation effects which, for some samples, result in salt precipitation at elevated temperatures. 23Na chemical shifts observed in solid state NMR due to mobile Na ions are obtainable without the use of high resolution techniques, and exhibit strong dependences on anion and temperature. These results indicate the Na-anion interactions influence ionic transport as well as the number of available carriers.

Subject Categories:

  • Inorganic Chemistry
  • Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE