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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 (ac) 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 dc 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.
Page(s): 204-213
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(03) [March 2011]

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