Sulfonated polyaryletherketone with pendant benzimidazole groups for proton exchange membranes
作者：Jun Liang, Jiao Ge, Kai Wu, Qi Zhang, Jianli Wang*, Zhibin Ye**
關(guān)鍵字：proton exchange membranes; amphoteric polymers; sulfonated polyaryletherketone
論文來源：期刊
具體來源：Journal of Membrane Science
發(fā)表時間：2019年
我們合成了一系列磺化聚芳醚酮(x%SCBI-SPAEK-6F)與苯并咪唑側(cè)基，其摩爾百分比可調(diào)(x在5 - 15%)，具有作為質(zhì)子交換膜(PEM)的潛在應用價值。系統(tǒng)地研究了這些新型兩性聚合物的性能及其結(jié)構(gòu)與性能之間的關(guān)系。結(jié)果表明，隨著苯并咪唑含量的增加，x%SCBI-SPAEK-6F膜的尺寸穩(wěn)定性、氧化穩(wěn)定性和耐甲醇性能顯著提高。特別是5%SCBI-SPAEK-6F膜在75℃時的相對選擇性(10.5×103 S S cm-3)幾乎是Nafion117膜的20倍，說明酸堿交聯(lián)作用顯著提高了質(zhì)子電導率(0.35 S cm-1)，降低了甲醇滲透率(6×10-7 cm2 S -1)。這些聚合物具有優(yōu)異的性能，有望用于商業(yè)燃料電池中質(zhì)子交換膜的制備。
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