FTIR and Solid State13C NMR Studies on the Interaction of Lithium Cations with Polyether Poly(urethane urea)

Hsing Lung Wang, Hsien Ming Kao, Mohanlal Digar, Ten Chin Wen

研究成果: Article同行評審

48 引文 斯高帕斯(Scopus)

摘要

The behaviors oflithium ions in a polyether poly(urethane urea) (PEUU) were investigated by differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, ac impedance and 13C magic angle spinning (MAS) solid-state NMR measurements. The PEUU used in this study is composed of polyethylene glycol) (PEG, mol wt 1000) as the soft segment and 4,4′-methylenebis(cyclohexyl isocyanate) extended with ethylenediamine (EDA) as the hard segment. The results of DSC measurements indicate the formation of transient cross-links between Li+ ions and the ether oxygens on complexation with LiClO4, resulting in an increase in the soft segment Tg. A detailed analysis of -NH stretching regions shows an appreciable shift in the free as well as the hydrogen-bonded -NH stretching bands, suggesting possible interactions of Li+ ions with both hard and soft segments of PEUU. The Arrhenius-like behavior of ionic conductivity with reciprocal temperature implies an activated hopping mechanism for transport of the charge carriers where the charge carriers are decoupled from the segmental motion of the polymer chains. Moreover, significant line broadening, slight upfield chemical shift, and short TCH, observed in the 13C NMR spectra for the carbons attached to the ether oxygens as the dopant was added into the polymer, indicate a coordination between the Li cation and the ether oxygens in the soft segments.

原文English
頁(從 - 到)529-537
頁數9
期刊Macromolecules
34
發行號3
DOIs
出版狀態Published - 2001 1月 30

All Science Journal Classification (ASJC) codes

  • 有機化學
  • 聚合物和塑料
  • 無機化學
  • 材料化學

指紋

深入研究「FTIR and Solid State13C NMR Studies on the Interaction of Lithium Cations with Polyether Poly(urethane urea)」主題。共同形成了獨特的指紋。

引用此