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首页> 外文期刊>Journal of Applied Polymer Science >Fabrication of hybrid proton-exchange membranes using a brandnew high temperature ionic liquid as charge transporting and clay modifier
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Fabrication of hybrid proton-exchange membranes using a brandnew high temperature ionic liquid as charge transporting and clay modifier

机译：使用全新的高温离子液体作为电荷输送和粘土改性剂的杂交质子交换膜的制备

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摘要

The search for more compatibility between ionic liquids (ILs) and polymer matrices in proton-exchange membrane fuel cells (PEMFCs) is one of the ways in which IL leaking from proton-exchange membranes could be minimized. In this work, it is presented the synthesis of an aromatic high temperature ionic liquid (HTIL), which, incorporated into an aromatic matrix such as sulfonated polyether ether ketone (sPEEK), is expected to diminish the IL leaking that normally affects PEMFC. Phenylethylammonium trifluoromethane sulfonate (PhetaTfO) was successfully synthesized and characterized. Its melting point of 88 degrees C makes it to classify as a HTIL and it was employed as modifier of natural Montmorillonite, forming the phenylethylammonium intercalated montmorillonite (MmtPheta) and thus, ternary membranes containing PhetaTfO, MmtPheta, and sPEEK were prepared and characterized. Immersion tests demonstrated a higher compatibility of PhetaTfO with matrix when compared to the reference DemaTfO, which was reflected in up to 30% lower IL loss by the synthesized IL than the DemaTfO; X-rays diffraction (XRD) patterns demonstrated that the modified clay was properly dispersed inside the membranes, while dynamic mechanical analyses (DMA) results indicated a strong plasticizer effect along the increase of PhetaTfO content inside the membrane, while at the same time, the conductivity increased in an exponential manner, which permitted to identify an empiric exponential equation to evaluate the effect of concentration on ionic conductivity. The maximum conductivity obtained at IL concentrations of around 38 wt% was 0.2 mS/cm. It could expect high ionic conductivities of 10 mS/cm when the concentration of this IL is 60%; nevertheless, in order to achieve that, crosslinking treatments should be done to give the membranes enough mechanical resistance.
机译：在质子交换膜燃料电池（PEMFC）中，寻求离子液体（ILs）和聚合物基质之间更大的相容性是将离子液体从质子交换膜泄漏降至最低的方法之一。在这项工作中，提出了一种芳香族高温离子液体（HTIL）的合成方法，将其加入到磺化聚醚醚酮（sPEEK）等芳香族基质中，有望减少通常影响PEMFC的IL泄漏。成功地合成并表征了苯乙基三氟甲烷磺酸铵（PhetaTfO）。其88℃的熔点使其被归类为HTIL，并被用作天然蒙脱石的改性剂，形成苯乙基铵插层蒙脱石（MmtPheta），因此，制备并表征了含有Phetafo、MmtPheta和sPEEK的三元膜。浸泡试验表明，与参考DemaTfO相比，Phetafo与基质具有更高的相容性，这反映在合成的IL比DemaTfO降低了高达30%的IL损失；X射线衍射（XRD）图谱表明，改性粘土在膜内得到了适当的分散，而动态力学分析（DMA）结果表明，随着膜内PhetaTfO含量的增加，增塑剂的作用很强，同时，电导率呈指数增长，它允许识别一个经验指数方程来评估浓度对离子导电性的影响。在约38 wt%的IL浓度下获得的最大电导率为0.2 mS/cm。当该离子浓度为60%时，其离子导电率有望达到10ms/cm；然而，为了实现这一点，应进行交联处理，以使膜具有足够的机械阻力。

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