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Critical Role of Ion Exchange Conditions on the Properties of Network Ionic Polymers

机译：离子交换条件对网络离子聚合物性质的关键作用

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摘要

Ionic polymers are important in a wide range of applications and can exhibit widely different properties depending on the ionic species. In the case of single ion conducting polymers, where one charge is attached to the backbone or as a side group, ion exchange is performed to control the mobile species. While the conditions are often specified, the final ion content is not always quantified, and there are no dear criteria for what concentration of salt is needed in the exchange. A series of ammonium network ionic polymers with different precise carbon spacers (C4-C7) between ionic junctions were synthesized as model systems to understand how the ion exchange conditions impact the resultant polymer properties. The initial networks with free bromide anions were exchanged with 1.5, 3, or 10 equiv of lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt in solution. For networks with seven carbons between cross-links, increasing the LiTFSI concentration led to an increase in ion exchange efficiency from 83.6 to 97.6 mol %. At the highest conversion, the C7 network showed a 4 degrees C decrease in glass transition temperature (T-g), a SO degrees C increase in degradation temperature, 12-fold lower water uptake from air, and a greater than 10-fold increase in conductivity at 90 degrees C. These results illustrate that properties such as T-g are less sensitive to residual ion impurities, whereas the conductivity is highly dependent on the final exchange conversion.
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  • 来源
    《ACS Macro Letters》 |2020年第12期|共8页
  • 作者

    Shan Naisong; Shen Chengtian; Evans Christopher M.;

  • 作者单位

    Univ Illinois Dept Mat Sci &

    Engn Dept Chem Urbana IL 61801 USA;

    Univ Illinois Frederick Seitz Mat Res Lab Urbana IL 61801 USA;

    Univ Illinois Frederick Seitz Mat Res Lab Dept Mat Sci &

    Engn Urbana IL 61801 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
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