Accession Number:

ADA280328

Title:

Complex Impedance, DSC and Lithium-7 NMR Studies of Poly(propylene oxide) Complexed with LiN(SO2CF3)2 and with LiAsF6

Descriptive Note:

Interim technical rept.

Corporate Author:

HUNTER COLL NEW YORK DEPT OF PHYSICS AND ASTRONOMY

Report Date:

1994-01-01

Pagination or Media Count:

12.0

Abstract:

Complex impedanceelectrical conductivity, differential scanning calorimetry and 7Li nuclear magnetic resonance measurements on poly propylene oxide complexed with two lithium salts LiNSO2CF32 and LiAsF6, with compositions of eight ether oxygens per lithium, are reported. Ionic mobility, as probed by NMR linewidth and spin-lattice relaxation measurements, is strongly coupled to polymer segmental motion above Tg. The electrical conductivity for PPO8LiAsF6 is about an order of magnitude smaller than for PPO8LiNSO2CF32. This is a consequence of the higher glass transition temperature for PPO8LiASF6. The stretched exponential parameter betasc, obtained in fits to electric modulus data, was found to be about 0.51 for PPO8LiNSO2CF32 and 0.57 for PPO8LiAsF6. Polymer electrolytes, Lithium-7 NMR Polypropylene oxide.

Subject Categories:

  • Inorganic Chemistry
  • Organic Chemistry
  • Polymer Chemistry
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE