POLY 143 |
| Solid polymer electrolytes (SPEs) have been widely investigated since the discovery of ionic conductivity in the polyether/alkali metal complex PEO/KSCN by Wright et al. in the 1970s. It is widely accepted that amorphous polymers with low glass transition temperatures and a high segmental mobility are important prerequisites for high ionic conductivities. The more recent synthesis and conductivity studies of a bis-substituted polysiloxane with pendant oligo(ethylene glycol) chains have been reported by Hooper et al. A six-oxygen side-chain polymer host when doped with LiTFSI showed the highest room temperature conductivity (4.0 x 10-4 S cm-1) yet observed for a polymer electrolyte. However, the dimensional stability of these polymer electrolytes is poor. It is not possible to use the complexes as separators in all solid-state lithium polymer batteries since the glutinous materials flow even under mild pressure at ambient temperature. To overcome these disadvantages, we have synthesized poly(oxyethylene) derivatives containing polyhedral oligomeric silsesquioxane which has been known to enhance mechanical and thermal properties. The poly(oxythylene) derivatives were obtained via hydrosilylation reaction of allyl-terminated part with Si-H group in the presence of platinum catalyst and polymer analogue reaction to incorporate oligo(ethyleneglycol) in the side chain. |
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General Papers: Functional Materials
6:00 PM-8:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Polymer Chemistry |