The effect of EPIDA units on the conductivity of poly(ethylene glycol)-4,4′-diphenylmethane diisocyanate-EPIDA polyurethane electrolytes

Shao Ming Lee, Chuh-Yung Chen, Cheng Chien Wang, Yao-Hui Huang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Novel thermoplastic polyurethanes with chelating groups were synthesized from 4,4′-diphenylmethane diisocyanate (MDI), poly(ethylene glycol) (PEG), and EP-IDA. Differential scanning calorimetry (DSC), fourier transform infrared spectroscopy (FT-IR), and impedance spectroscopy (IS) were used to monitor changes in the morphology of these polyurethanes with the concentration of lithium perchlorate (LiClO4) dopants. Adding the salt significantly changes the FTIR spectrum of the polyurethane, indicating an interaction between the lithium cation within the urethane group and the chelating group. The soft segment Tg increases with LiClO4 concentration, as determined by DSC, indicating that solubility of the lithium cation in the host polyurethane increases with the chelating groups. IS shows that the bulk conductivity reaches a maximum as the salt concentration is increased. One of the investigated polyurethane electrolytes has an ionic conductivity as high as ∼ 10-6 S cm-1 at room temperature.

Original languageEnglish
Pages (from-to)669-677
Number of pages9
JournalElectrochimica Acta
Volume48
Issue number6
DOIs
Publication statusPublished - 2003 Feb 5

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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