Effect of polypyrrole on the morphology and ionic conductivity of TPU electrolyte containing LiClO4

Ten Chin Wen, Shiue Liang Hung, M. Digar

研究成果: Article同行評審

29 引文 斯高帕斯(Scopus)

摘要

The effect of conducting polypyrrole (PPy) on the morphology and ionic conductivity of thermoplastic polyurethane (TPU) doped with LiClO4 has been described and compared with those of pure TPU system. The TPU-PPy composites were prepared by chemical polymerization of pyrrole inside TPU films. All samples were characterized by their swelling behavior in a liquid electrolyte (LiClO4/PC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and AC impedance measurements. Swelling studies indicate an improved chemical stability of the composite compared to TPU. From TGA, the thermal stability of the composite was found to be comparable to pure TPU. A decrease in Tg of the soft segment was observed in the composite from DSC experiments. This may be due to interaction of PPy-NH groups with either carbonyl or ether oxygens of TPU, leading to phase separation of the hard and soft segments. The SEM micrograph of the composite shows the presence of typical cauliflower-like morphology of PPy. The ionic conductivity of the composite was found to be about one order of magnitude higher than pure TPU having the same amount of LiClO4/PC. The enhancement of conductivity in presence of PPy may be associated with the increased mobility of ClO4- ions promoted by coordination of Li+ ions with PPy nitrogen atoms.

原文English
頁(從 - 到)11-18
頁數8
期刊Synthetic Metals
118
發行號1-3
DOIs
出版狀態Published - 2001 3月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 材料力學
  • 機械工業
  • 金屬和合金
  • 材料化學

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