Abstract
Effects of ceramic fillers (α-Al 2O 3, γ-Al 2O 3 and BaTiO 3) have been investigated on the ionic conductance of polymeric complexes consisting of poly(ethylene oxide)-modified poly(methacrylate) (PEO-PMA) and lithium bis(trifluoromethylsulfonyl)imide, Li(CF 3SO 2) 2N, and ceramic powder. The addition of ceramic powder increased the ionic conductivity over an ambient temperature range. Conductivity of 4.9 × 10 − 5 S cm − 1 at 333 K (60 °C) was obtained for the composite containing 15 wt.% α-Al 2O 3 prepared by photo-polymerization. The optimum content of Al 2O 3 was different among the methods of polymerization. The highest conductivity was obtained for the composite containing 5 wt.% of α-, or γ-Al 2O 3 prepared by thermal polymerization. The addition of the ceramic filler scarcely influenced the thermal properties of the polymer matrix. XRD and NMR experiments showed that the ionic mobility could be enhanced in the composites by addition of α-Al 2O 3. The addition of small amounts of ferroelectric BaTiO 3 also increased the ionic conductivity of the polymeric complex, but its extent was smaller than the case of the Al 2O 3 addition.
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