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Ion and solvent dynamics in gel electrolytes based on ethylene oxide grafted acrylate polymers

journal contribution
posted on 01.11.2002, 00:00 authored by J Adebahr, Maria ForsythMaria Forsyth, P Gavelin, P Jacobbson, G Orädd
Multinuclear pulsed field gradient NMR measurements and rheological viscosity measurements were performed on three series of polymer gel electrolytes. The gels were based on a lithium salt electrolyte swollen into a copolymer matrix comprising an acrylate backbone and ethylene oxide side chains. In each series the side chains differed in length and number, but the acrylate-to-ethylene oxide ratio was kept constant. It was found that the self-diffusion coefficient of the cations was much lower than that of the anions, and that it decreased rapidly when the side chains got longer. In contrast, the self-diffusion coefficient of the anions was found to be independent of chain length. In the gel electrolytes, the diffusion coefficients of the solvent molecules are relatively constant despite an increased viscosity with increasing length of the side chains. However, in salt-free gels made for comparison, the diffusion coefficients of the solvent molecules decreased with increasing length of the side chains, which is consistent with an increased viscosity.

History

Journal

Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical

Volume

106

Issue

47

Pagination

12119 - 12123

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

1520-6106

eISSN

1520-5207

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2002, American Chemical Society