The effect of salt concentration in filler modified PMMA/ ENR 50/ LiCF3SO3 electrolyte / Nunshaimah Salleh

A freestanding film was obtained from poly(methylmetacrylate), PMMA/50% epoxidised natural rubber, ENR 50 blend by casting method. It was found that the addition of 0.1 g of Si02 filler improved the dispersion of ENR 50 in the blend system. This has been confirmed from its optical micrograph. The addition of filler also increased the amount of salt that could be dissolved in the PMMA blend. It was found that the maximum amount of salt that can be accommodated into the system was 0.3 g. Blend containing this amount of salt exhibited the highest ionic conductivity of 10"7 S cm"1 at room temperature. From its optical micrograph, it showed the most smooth surface which assist the transportation of lithium ion in the polymer blend matrix. It also showed the highest intensity of »(S03) band indicating the presence highest number of free triflate anion. When more than 0.3 g of salt was added into the blend, the overall system became congested with excessive lithium salt which reduced the ionic conductivity of the system.