Accession Number : ADA304869

Title :   High Pressure NMR and Electrical Conductivity Studies of Gel Electrolytes Based on Poly(acrylonitrile).

Descriptive Note : Interim technical rept.,

Corporate Author : CITY UNIV OF NEW YORK DEPT OF PHYSICS

Personal Author(s) : Edmondson, Charles A. ; Wintersgill, Mary C. ; Fontanella, John J. ; Gerace, Furio ; Scrosati, Bruno

PDF Url : ADA304869

Report Date : 26 JAN 1996

Pagination or Media Count : 21

Abstract : The effect of high pressure on electrical conductivity and NMR in gels prepared from lithium or sodium perchlorate, ethylene carbonate, dimethyl carbonate and poly(acrylonitrile) (PAN) has been determined. The corresponding liquids were also studied. Complex impedance studies at frequencies from 10 to 10 (exp -8) Hz and NMR measurements of T1 were carried out as a function of pressure up to 0.25 GPa. Activation volumes for NMR relaxation and ionic conductivity were calculated from the variable pressure data. Both activation volumes were found to be approximately the same in the liquids. For the gels, however, the NMR activation volumes are the same or lower than for the liquid while the electrical conductivity activation volumes are larger. The implications of these results are discussed in terms of possible effects of PAN in the, ionic solvation shell. jg

Descriptors :   *NUCLEAR MAGNETIC RESONANCE, *ACRYLONITRILE POLYMERS, *HIGH PRESSURE, *ELECTRICAL CONDUCTIVITY, *ELECTROLYTES, *GELS, IONS, ACTIVATION, CONDUCTIVITY, METHYL RADICALS, LIQUIDS, LITHIUM, SOLVATION, IMPEDANCE, ETHYLENES, VARIABLE PRESSURE, CARBONATES, PERCHLORATES, SODIUM COMPOUNDS.

Subject Categories : Physical Chemistry
      Polymer Chemistry
      Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE