Relaxation process in chitosan–oxalic acid solid polymer electrolytes

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• 作者：I. A. Fadzallah (1)
  S. R. Majid (1)
  M. A. Careem (1)
  A. K. Arof (1)
  
• 关键词：Chitosan ; Oxalic acid ; Ionic conductivity ; Electrical modulus
• 刊名：Ionics
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：20
• 期：7
• 页码：969-975
• 全文大小：
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• 作者单位：I. A. Fadzallah (1)
  S. R. Majid (1)
  M. A. Careem (1)
  A. K. Arof (1)
  
  1. Centre for Ionics of University of Malaya (CIUM), Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia
  
• ISSN：1862-0760

文摘

We investigate the room temperature frequency dependence of electrical modulus for the polymer electrolytes consisting of chitosan and oxalic acid in the frequency range from 50?Hz to 1?MHz. Oxalic acid serves as the proton provider. It is found that the lowest imaginary electrical modulus is shown by the highest conducting sample OA40, which contains 60?wt.% chitosan and 40?wt.% oxalic acid. The electrical moduli for OA40 sample membrane at different temperatures are also studied, and the peak of the imaginary electrical modulus has been observed to shift towards higher frequency with increasing temperature. This indicates that relaxation is thermally assisted. Analysis of electrical modulus shows that the main relaxation process in chitosan–oxalic acid polymer electrolyte system is a non-Debye process associated with viscoelastic relaxation.