writer：Jun Liang, Jiao Ge, Kai Wu, Qi Zhang, Jianli Wang*, Zhibin Ye**
keywords：proton exchange membranes; amphoteric polymers; sulfonated polyaryletherketone
source：期刊
specific source：Journal of Membrane Science
Issue time：2019年

我们合成了一系列磺化聚芳醚酮(x%SCBI-SPAEK-6F)与苯并咪唑侧基，其摩尔百分比可调(x在5 - 15%)，具有作为质子交换膜(PEM)的潜在应用价值。系统地研究了这些新型两性聚合物的性能及其结构与性能之间的关系。结果表明，随着苯并咪唑含量的增加，x%SCBI-SPAEK-6F膜的尺寸稳定性、氧化稳定性和耐甲醇性能显著提高。特别是5%SCBI-SPAEK-6F膜在75℃时的相对选择性(10.5×103 S S cm^-3)几乎是Nafion117膜的20倍，说明酸碱交联作用显著提高了质子电导率(0.35 S cm^-1)，降低了甲醇渗透率(6×10^-7 cm² S ^-1)。这些聚合物具有优异的性能，有望用于商业燃料电池中质子交换膜的制备。

We synthesized a range of sulfonated polyaryletherketone (x%SCBI-SPAEK-6F) with pendant benzimidazole side groups at a tunable molar percentage (x within 5-15%) for potential application as proton exchange membrane (PEM). A systematic study had been undertaken to study the performance and the underlying structure-properties relationship of PEMs fabricated by those novel amphoteric polymers. It was found that the dimensional stability, oxidative stability and methanol resistance performance of x%SCBI-SPAEK-6F membranes were significantly improved with the increase of the benzimidazole content due to the acid-base interaction. In particular, the 5%SCBI-SPAEK-6F membrane exhibited a relative selectivity (10.5×10³ S s cm^-3) almost 20 times higher than that of Nafion117 membrane at 75℃, demonstrating the significant promoted proton conductivity (0.35 S cm^-1) and reduced methanol penetration (6 ×10^-7 cm² s^-1) by the ionic barrier. With such superior performance, these polymers are promising for the fabrication of practical proton exchange membranes in commercial fuel cells.

Scheme 1. Synthesis of x%SCBI-60SPAEK-6F polymers and chemical structure of x%MCBI-60SPAEK-6F.  

DOI: https://doi.org/10.1016/j.memsci.2019.117626