NDLI: Effect of melt compounding temperature on dielectric relaxation and ionic conduction in PEO–NaClO$

Content Provider	Springer Nature Link
Author	Sengwa, R. J. Sankhla, Sonu Choudhary, Shobhna
Copyright Year	2010
Abstract	Polymer nanocomposite electrolytes (PNCEs) of poly(ethylene oxide) and sodium perchlorate monohydrate complexes with montmorillonite (MMT) clay up to 20 wt.% MMT concentration of poly(ethylene oxide) (PEO) are synthesized by melt compounding technique at melting temperature of PEO (∼70 °C) and NaClO$_{4}$ monohydrate (∼140 °C). Complex dielectric function, electric modulus, alternating current (ac) electrical conductivity, and impedance properties of these PNCEs films are investigated in the frequency range 20 Hz to 1 MHz at ambient temperature. The direct current conductivity of these materials was determined by fitting the frequency-dependent ac conductivity spectra to the Jonscher power law. The PNCEs films synthesized at melting temperature of NaClO$_{4}$ monohydrate have conductivity values lower than that of synthesized at PEO melting temperature. The complex impedance plane plots of these PNCEs films have a semicircular arc in upper frequency region corresponding to the bulk material properties and are followed by a spike in the lower frequency range owing to the electrode polarization phenomena. Relaxation times of electrode polarization and ionic conduction relaxation processes are determined from the frequency values corresponding to peaks in loss tangent and electric modulus loss spectra, respectively. A correlation is observed between the ionic conductivity and dielectric relaxation processes in the investigated PNCEs materials of varying MMT clay concentration. The scaled ac conductivity spectra of these PNCEs materials also obey the ac universality law.
Starting Page	697
Ending Page	707
Page Count	11
File Format	PDF
ISSN	09477047
Journal	Ionics
Volume Number	16
Issue Number	8
e-ISSN	18620760
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer nanocomposite electrolytes Dielectric relaxation Poly(ethylene oxide) Ionic conductivity Complex impedance Electric modulus Condensed Matter Physics Optical and Electronic Materials Renewable and Green Energy Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Engineering Materials Science Chemical Engineering

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