Impact of Hydration and Sulfonation on the Morphology and Ionic Conductivity of Sulfonated Poly(phenylene) Proton Exchange Membranes
Impact of Hydration and Sulfonation on the Morphology and Ionic Conductivity of Sulfonated Poly(phenylene) Proton Exchange Membranes
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DOI：
10.1021/acs.macromol.8b02013
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发表时间：
2019-01
期刊：
影响因子：
5.5
通讯作者：
E. Sorte;Benjamin A. Paren;C. G. Rodriguez;Cy H. Fujimoto;Cassandria Poirier;L. Abbott;Nathaniel A. Lynd;K. Winey;A. Frischknecht;T. Alam
中科院分区：
文献类型：
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作者：
E. Sorte;Benjamin A. Paren;C. G. Rodriguez;Cy H. Fujimoto;Cassandria Poirier;L. Abbott;Nathaniel A. Lynd;K. Winey;A. Frischknecht;T. Alam
使用多种计算和实验技术来了解一系列磺化狄尔斯-阿尔德聚（亚苯基）（SDAPP）膜在广泛的温度、水合和磺化条件下的纳米级形态和水/质子传输性能。新的合成方法使我们能够将SDAPP膜磺化到比以前可能的更高的离子交换容量水平。疏水聚合物主链和亲水性水/磺酸基团之间的纳米级相分离，观察到所有的膜研究。我们发现原子分子动力学（MD）模拟计算的结构因子和X射线散射测量的结构因子之间有很好的一致性。随着水化程度的增加，SDAPP中的散射离聚物峰的强度降低。这种强度降低是由于水和聚合物之间的散射对比度的降低，并不表示纳米级相分离的任何损失。两种MD模拟...
Multiple computational and experimental techniques are used to understand the nanoscale morphology and water/proton transport properties in a series of sulfonated Diels–Alder poly(phenylene) (SDAPP) membranes over a wide range of temperature, hydration, and sulfonation conditions. New synthetic methods allow us to sulfonate the SDAPP membranes to much higher ion exchange capacity levels than has been previously possible. Nanoscale phase separation between the hydrophobic polymer backbone and the hydrophilic water/sulfonic acid groups was observed for all membranes studied. We find good agreement between structure factors calculated from atomistic molecular dynamics (MD) simulations and those measured by X-ray scattering. With increasing hydration, the scattering ionomer peak in SDAPP is found to decrease in intensity. This intensity decrease is shown to be due to a reduction of scattering contrast between the water and polymer and is not indicative of any loss of nanoscale phase separation. Both MD simula...