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Structural, thermal, and electrical studies of sodium iodide (NaI)-doped hydroxypropyl methylcellulose (HPMC) polymer electrolyte films

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Abstract

Solid polymer electrolyte films based on hydroxypropyl methylcellulose (HPMC) complexed with sodium iodide (NaI) were prepared using solution cast method. The dissolution of the salt into the polymer host and the structural properties of pure and complexed HPMC polymer electrolyte films were confirmed by X-ray diffraction (XRD) studies. XRD results revealed that the amorphous domains of HPMC polymer matrix were increased with increase in NaI salt concentration. The degree of crystallinity was found to be high in pure HPMC samples. The thermal properties were studied using differential scanning calorimetry (DSC). DSC results revealed that the presence of NaI in the polymer matrix increases the melting temperature; however, it is observed that fusion heat is high for pure HPMC films. The variation of film morphology was examined by scanning electron microscopy. Fourier transform infrared spectral studies revealed vibrational changes that occurred due to the effect of dopant salt in the polymer. Direct current conductivity was measured in the temperature range of 313–383 K. The magnitude of electrical conductivity was found to increase with the increase in salt and temperature concentration. The data on the activation energy regions (regions I and II) indicated the dominance of ion-type charge transport in these polymer electrolyte films. The composition HPMC:NaI (5:4) is found to exhibit the least crystallinity and the highest conductivity.

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Acknowledgments

The authors acknowledge all the support and the useful discussion by Professor Srikantaiah, Retired Scientist, BARC, Mumbai. We are thankful to the technical staff at SID and Material Science Department, IISc, Bangalore for DSC, FTIR, and SEM analysis. We thank Grian Technologies Pvt. Limited, Bangalore for their support in electrical conductivity studies. Special thanks to Dr Shibu M Eappen, Scientist in Charge, SAIF Cochin University of Science and Technology, Cochin, for XRD measurements.

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Authors and Affiliations

  1. Department of Physics, Vidyavardhaka College of Engineering, Mysore, 570002, India

    N. Sandhya Rani

  2. Department of Studies in Physics, Jnana Sahyadri, Kuvempu University, Shimoga, 577451, India

    J. Sannappa

  3. Department of Polymer Science, Sir M V, P G Centre, University of Mysore, Mandya, 575007, India

    T. Demappa &  Mahadevaiah

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  1. N. Sandhya Rani
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  2. J. Sannappa
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  3. T. Demappa
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  4. Mahadevaiah
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Correspondence to J. Sannappa.

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Rani, N.S., Sannappa, J., Demappa, T. et al. Structural, thermal, and electrical studies of sodium iodide (NaI)-doped hydroxypropyl methylcellulose (HPMC) polymer electrolyte films. Ionics 20, 201–207 (2014). https://doi.org/10.1007/s11581-013-0952-8

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