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Effect of melt compounding temperature on dielectric relaxation and ionic conduction in PEO–NaClO4–MMT nanocomposite electrolytes

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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 NaClO4 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 NaClO4 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.

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Acknowledgments

Authors are grateful to the DST, New Delhi for providing the experimental facilities through project no. SR/S2/CMP-09/2002. One of the authors SS is thankful to CSIR, New Delhi for the award of Research Associateship, and SC is thankful to the UGC, New Delhi for the award of RFSMS fellowship.

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Authors and Affiliations

  1. Dielectric Research Laboratory, Department of Physics, JNV University, Jodhpur, 342 005, India

    R. J. Sengwa, Sonu Sankhla & Shobhna Choudhary

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  1. R. J. Sengwa
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  2. Sonu Sankhla
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  3. Shobhna Choudhary
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Correspondence to R. J. Sengwa.

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Sengwa, R.J., Sankhla, S. & Choudhary, S. Effect of melt compounding temperature on dielectric relaxation and ionic conduction in PEO–NaClO4–MMT nanocomposite electrolytes. Ionics 16, 697–707 (2010). https://doi.org/10.1007/s11581-010-0453-y

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  • DOI: https://doi.org/10.1007/s11581-010-0453-y

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