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FT-IR studies on interactions among components in hexanoyl chitosan-based polymer electrolytes.

Tan Winie1, A K Arof

  • 1Physics Department, University of Malaya, 50603 Kuala Lumpur, Malaysia.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 15, 2005
PubMed
Summary

Fourier transform infrared spectroscopy reveals interactions in hexanoyl chitosan-based electrolytes. Lithium salt complexation with chitosan was observed, alongside competition for ions between plasticizers and the polymer.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Electrochemistry

Background:

  • Chitosan-based electrolytes are promising for electrochemical applications.
  • Understanding component interactions is crucial for optimizing electrolyte performance.
  • Hexanoyl chitosan offers modified properties compared to native chitosan.

Purpose of the Study:

  • To investigate interactions within hexanoyl chitosan-lithium trifluoromethanesulfonate-diethyl carbonate/ethylene carbonate systems.
  • To correlate spectroscopic findings with conductivity performance.
  • To elucidate the role of plasticizers and salt in the polymer matrix.

Main Methods:

  • Fourier transform infrared (FT-IR) spectroscopy was employed.
  • Analysis of spectral shifts in functional groups (N(COR)(2), CONHR, OCOR).

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  • Correlation of spectroscopic data with ionic conductivity measurements.

    • Main Results:

    • Formation of a hexanoyl chitosan-lithium trifluoromethanesulfonate complex was confirmed by spectral shifts.
    • Interactions between ethylene carbonate and diethyl carbonate were observed.
    • No direct interaction was found between the polymer host and plasticizers.
    • Competition for Li(+) ions between plasticizers and hexanoyl chitosan was evident.

    Conclusions:

    • Spectroscopic evidence supports the formation of a polymer-salt complex.
    • Plasticizer-polymer interactions do not occur, but competition for Li+ ions does.
    • The study provides insights into the structure-property relationships of these gel polymer electrolytes.