Ionic Conductivity in Solid, Crosslinked Dimethylsiloxane-Ethylene Oxide Copolymer Networks Containing Sodium

The preparation of an ion-conducting elastomeric solid based on a dimethylsiloxane-ethylene oxide copolymer complexed with a sodium salt is described. Sodium 23 Nuclear Magnetic Resonance measurements reveal the presence of both bound and mobile sodium species throughout the temperature range -120 t...

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Bibliographic Details
Main Authors: Adamic,K J, Greenbaum,S G, Wintersgill,M C, Fontanella,J J
Format: Report
Language:English
Subjects:
CONDUCTIVITY
COPOLYMERS
CROSSLINKING(CHEMISTRY)
ELASTOMERS
Elastomers and Rubber
ELECTRICAL CONDUCTIVITY
ELECTRICAL MEASUREMENT
Electricity and Magnetism
ENTROPY
ETHYLENE OXIDE
GLASS
Ion conducting polymers
Ionic conductivity
IONIC CURRENT
IONS
METHYL RADICALS
MOBILE
NUCLEAR MAGNETIC RESONANCE
PARAMETERS
POLYMERS
SALTS
SILOXANES
SODIUM
TEMPERATURE
TRANSITION TEMPERATURE
WUNR627846
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Summary:The preparation of an ion-conducting elastomeric solid based on a dimethylsiloxane-ethylene oxide copolymer complexed with a sodium salt is described. Sodium 23 Nuclear Magnetic Resonance measurements reveal the presence of both bound and mobile sodium species throughout the temperature range -120 to 100 C. Electrical conductivity measurements over a similar temperature range are found to be consistent with the configurational entropy model for transport, with a T sub o parameter about 50 C below the 'central' glass transition temperature T sub g. Keywords: Ion conducting polymers; Ionic conductivity.