S. Jayanthi and B. Sundaresan
Accepted Abstracts: J Material Sci
Aseries of nanocomposite polymer blend electrolytes (NCPBE?s) based on poly(ethylene oxide) (PEO), poly(vinyl chloride) (PVC), lithium perchlorate(LiClO 4 ) and nano sized TiO 2 (27.03nm) have been prepared by the solvent casting technique using conventional mechanical stirring and ultrasonic irradiation methods. AC impedance measurements have been carried out in the frequency range of 1Hz - 10 MHz. Ionic conductivity of NCPBE?s increases with increasing concentration of TiO 2 and also increases against the ultrasonic irradiation time. An increase in ionic conductivity, of the order of 10 -5 Scm -1 has been achieved for 4wt% of TiO 2 at an optimum ultrasonic irradiation time of 15 mins at room temperature than the sample without irradiation. The effect of ultrasonic irradiation on the dielectric properties and electric modulus have also been studied. In the low frequency region, the variation of dielectric constant with the frequency shows the presence of electrode interface polarization. Analysis of frequency dependence of dielectric and modulus spectra suggests that the ionic and polymer segmental motion are strongly coupled.
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