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Structural and electrical characterizations of 50:50 PVA:starch blend complexed with ammonium thiocyanate

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Abstract

The present work deals with the preparation and characterization of polymer blend electrolyte films. Glutaraldehyde is used as a cross-linker to cross-link polymers polyvinyl alcohol (PVA) and starch for the proper film formation. Structural characterizations such as X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) have been performed. X-ray diffraction is done to investigate the amorphous nature of the sample. FTIR study confirms about the complexation of salt with the polymer and interaction of thiocyanate ion with the polymer matrix. Electrical characterizations were done using impedance spectroscopy. DC and AC ionic conductivity was obtained at varying salt concentration in the films which shows maximum ionic conductivity of the polymer electrolyte containing 30 wt% of salt content. The AC conductivity behaviour of the polymer electrolyte follows Jonscher’s power law. Dielectric parameters such as dielectric constant, dielectric loss and loss tangent have been determined. Relaxation time is obtained and decreases to lower value with the increase in the salt concentration in the polymer electrolyte.

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Acknowledgments

One of the authors, N. Kulshrestha, is thankful to UGC for the award of Junior Research Fellowship (JRF) under University with Potential of Excellence Scheme (UPE). The authors are thankful to Mr. M. Gupta for kind help in the experimental observations.

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  1. Department of Physics, Banaras Hindu University, Varanasi, 221005, India

    N. Kulshrestha & P. N. Gupta

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  1. N. Kulshrestha
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  2. P. N. Gupta
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Correspondence to P. N. Gupta.

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Kulshrestha, N., Gupta, P.N. Structural and electrical characterizations of 50:50 PVA:starch blend complexed with ammonium thiocyanate. Ionics 22, 671–681 (2016). https://doi.org/10.1007/s11581-015-1588-7

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  • DOI: https://doi.org/10.1007/s11581-015-1588-7

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