Accession Number:

ADA280330

Title:

Sodium-23 NMR and Complex Impedance Studies of Gel Electrolytes Based on Poly(acrylonitrile).

Descriptive Note:

Interim technical rept. for period ending Jul 1993,

Corporate Author:

HUNTER COLL NEW YORK DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s):

• Greenbaum, S. G.
• Li, J.
• Stallworth, P. E.
• Croce, F.
• Slane, S.

Report Date:

1994-04-29

Pagination or Media Count:

29.0

Abstract:

Highly conducting gel electrolytes prepared from mixtures of polyacrylonitrile PAN, ethylene carbonate EC, propylene carbonate PC and NaClO4 have been studied by complex impedance, differential scanning calorimetry DSC and 23Na nuclear magnetic resonance NMR spectroscopy. Ionic motional correlation times spanning nearly five orders of magnitude, probed by temperature-dependent dynamical features of the 23Na quadrupole-broadened NMR lineshape, are strongly influenced by the single glass transition temperature observed in the gel electrolyte. Dielectric measurements of mixtures of PAN, EC and PC suggest that the polar nitrile group in PAN may interact with Na ions in the gel. All results are consistent with the conclusion that PAN provides stability to the gel network down to the immediate vicinity of the Na ions, rather than acting as a rigid framework for regions of liquid electrolyte. Gel electrolytes, Sodium-23 NMR, Polyacrylonitrile.

Descriptors:

• *COMPLEX COMPOUNDS
• *NUCLEAR MAGNETIC RESONANCE
• *SODIUM
• *ELECTROLYTES
• *ACRYLONITRILE POLYMERS
• *IMPEDANCE
• *GELS
• SCANNING
• TIME DEPENDENCE
• SPECTROSCOPY
• GLASS
• ETHYLENE
• CARBONATES
• CALORIMETRY
• SOLID STATE CHEMISTRY
• NITRILES
• TRANSITION TEMPERATURE
• PROPENES
• MIXTURES
• POLYMERS
• DIELECTRICS
• LIQUIDS
• NETWORKS
• IONS
• STABILITY

Subject Categories:

• Organic Chemistry
• Physical Chemistry
• Polymer Chemistry
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE