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Morphology and pervaporation performance of ionic liquid and waterborne polyurethane composite membranes

机译：离子液体和水性聚氨酯复合膜的形态和渗透渗透性能

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摘要

Blending an aromatic-selective ionic liquid (IL, namely 1-ethyl-3-methylimidazolium hexafluorophosphate, [emim][PF6]) with waterborne polyurethane (WPU) enabled us to obtain [emim][PF6]-modified waterborne polyurethane composite membranes. We characterized the structure and properties of the [emim][PF6]/WPU composite membranes by ATR-FTIR, DSC, UV, SEM, EDX, swelling tests, and pervaporation testing. Characterization of the change in the morphology of the membranes in response to the IL loading indicated that a preferential interaction between the IL and soft segments of WPU was induced by hydrogen bonding. This interaction inhibited a potential interaction with benzene (Bz), which initially lowered the permeability. However, at high IL loading, the IL incorporation became ineffective owing to macrophase separation, which caused an increase in the permeability, as indicated by the SEM results. Swelling testing of the [emim][PF6]/WPU composite membranes showed that the membranes exhibited preferential adsorption of Bz, and the swelling degree of the composite membranes in Bz solvent increased from 58% to 98% and remained almost constant in cyclohexane solvent as the IL content was increased. The [emim][PF6]/WPU composite membranes enhanced the separation selectivity of Bz/Cy for an IL loading 10 wt%. The best separation factor was 8.4, and the total flux was 0.19 kg (m(2) h)(-1) (50 wt% Bz/Cy mixtures at 50 degrees C) at w([emim][PF6]) : w(WPU) = 10 : 100. In addition, the composite membrane exhibited excellent stability over long-term operation. These results demonstrated that the [emim][PF6]/WPU composite membranes could be effective for separation of Bz/Cy mixtures by the pervaporation method.
机译：将芳族选择性离子液体（IL，即1-乙基-3-甲基咪唑鎓六氟磷酸铵，使我们能够获得水性聚氨酯（WPU）以获得[emim] [emim] [PF6]制定的水性聚氨酯复合膜。我们以ATR-FTIR，DSC，UV，SEM，EDX，溶胀试验和渗透散发测试表征了[emim] [emim] [PF6] / WPU复合膜的结构和性质。响应于IL负荷的表征膜的形态变化表明，通过氢键诱导IL和WPU的软链段之间的优先相互作用。该相互作用抑制与苯（BZ）的潜在相互作用，其最初降低渗透性。然而，在高IIL LOADING期间，由于MACOPHASE分离，IL掺入变得无效，这导致渗透率的增加，如SEM结果所示。 [emim] [PF6] / WPU复合膜的溶胀测试表明，膜表现出BZ的优先吸附，BZ溶剂中复合膜的溶胀度从58％增加到98％，并在环己烷溶剂中保持几乎恒定IL含量增加。 [emim] [PF6] / WPU复合膜增强了用于IL负荷的BZ / Cy的分离选择性。 10 wt％。最佳分离因子为8.4，总通量为0.19kg（m（2）小时）（ - 1）（在50℃下为50℃）（50℃），在w（[emim] [pf6]）：w （WPU）= 10：100.此外，复合膜在长期运行方面表现出优异的稳定性。这些结果表明，[emim] [PF6] / WPU复合膜可有效地通过渗透散发法分离BZ / Cy混合物。

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  • 来源
    《RSC Advances》 |2018年第14期|共8页
  • 作者

    Xi Tao; Tang Lin; Hao Wentao; Yao Lulu; Cui Peng;

  • 作者单位

    Hefei Univ Technol Anhui Key Lab Controllable Chem React &

    Mat Chem Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Anhui Key Lab Controllable Chem React &

    Mat Chem Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Anhui Key Lab Controllable Chem React &

    Mat Chem Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Anhui Key Lab Controllable Chem React &

    Mat Chem Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Anhui Key Lab Controllable Chem React &

    Mat Chem Sch Chem &

    Chem Engn Hefei 230009 Anhui Peoples R China;

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  • 中图分类 化学;
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