Accession Number:

ADA280195

Title:

High Pressure NMR and Electrical Conductivity Studies of Acid Form NAFION Membranes.

Descriptive Note:

Interim technical rept.,

Corporate Author:

HUNTER COLL NEW YORK

Personal Author(s):

• Chen, R. S.
• Stallworth, P. E.
• Greenbaum, S.
• Fontanella, J. J.
• Wintersgill, M. C.

Report Date:

1994-04-29

Pagination or Media Count:

22.0

Abstract:

The effect of high pressure on the electrical conductivity and proton, deuteron and 17O NMR in acid form NAFION-117 conditioned at various levels of relative humidity has been determined. NMR measurements of T1 were carried out as a function of pressure up to 0.25 GPa. The complex impedance studies were made along the plane of the film at frequencies from 10 to 10exp 8 Hz at room temperature and pressures up to 0.3 GPa. The electrical conductivity and proton and deuteron NMR measurements show that the activation volume for materials containing greater than about 3 water molecules per sulfonate is 2 to 3cu cmmol and larger values are found as the amount of water decreases. The implications of these results are discussed. The 170 NMR results are unexplained at the present time. NAFION, High Pressure NMR, High Pressure Conductivity

Descriptors:

• *NUCLEAR MAGNETIC RESONANCE
• *HIGH PRESSURE
• *ELECTRICAL CONDUCTIVITY
• *ACIDS
• *ION EXCHANGE
• *MEMBRANES
• FREQUENCY
• FUNCTIONS
• MEASUREMENT
• THERMODYNAMICS
• MATERIALS
• ROOM TEMPERATURE
• DEUTERONS
• HUMIDITY
• IMPEDANCE
• SULFONATES
• PROTONS
• FILMS
• POLYMERS
• WATER
• MOLECULES
• VOLUME
• ACTIVATION

Subject Categories:

• Physical Chemistry
• Electricity and Magnetism
• Fluid Mechanics
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE