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A 13C NMR study of the role of plasticizers in the conduction mechanism of solid polymer electrolytes

โœ Scribed by M. Forsyth; P.M. Meakin; D.R. MacFarlane

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
474 KB
Volume
40
Category
Article
ISSN
0013-4686

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โœฆ Synopsis

The addition of low molecular weight solvents such as dimethyl formamide (DMF) and propylene carbonate (PC) to urethane crosslinked polyethers results in enhancement of polymer segmental motion, as determined in this work from polymer i3C spin lattice relaxation measurements (T,) and glass transition temperatures.

The formation of salt-polyether complexes results in a decrease in Ti, even in the presence of the plasticizer, indicating that the polymer ether molecules are still involved in the alkali metal coordination.

In a polymer electrolyte containing 1 mol kg-' LiClO, the addition of DMF and PC have significantly different affects on the polymer mobility, although they both enhance the conductivity. The conductivity enhancement therefore is not solely the result of an increased solvent mobility.

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