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Title: Dielectric relaxation spectroscopy and ion conduction in poly(ethylene oxide)-blend salts-montmorillonite nanocomposite electrolytes
Authors: Choudhary, Shobhna
Sengwa, R J
Keywords: Polymer nanocomposite electrolytes
Dielectric relaxation
Ionic conductivity
Issue Date: Mar-2011
Publisher: NISCAIR-CSIR, India
Abstract: Poly(ethylene oxide) (PEO) and blend alkaline metal salts (equal number of cations of lithium perchlorate trihydrate and sodium perchlorate monohydrate) complexations with montmorillonite (MMT) nanoclay filler up to 20 wt% concentration were synthesized by direct melt compounded hot-press technique at temperature 104°C under 3 tons pressure. The spectra of complex dielectric function, electric modulus, and alternating current (<i style="">ac</i>) electrical conductivity and complex impedance plane plots of these polymer nanocomposite electrolytes were investigated in the frequency range 20 Hz - 1 MHz at ambient temperature. Relaxation times corresponding to electrode polarization and ionic conduction relaxation processes, and their correlation with <i style="">dc</i> ionic conductivity were explored. It has been recognized that the increase of MMT concentration results in stiffening of the PEO–MMT transient cross-linked structures, which decreases the PEO chain segmental dynamics and the cations translational motion.
Description: 204-213
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(03) [March 2011]

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