A comblike polymer (SPOS) with a main/side-chain bisulfonated structure has been synthesized with 1,3-propane sulfonate as the pendant chains and poly (ether ketone) (PEEK) as the reactant by the combined post-sulfonation and ring-opening grafting reaction. Taking sulfonated PEEK as a membrane matrix, the composite membranes (S/SPOS) are prepared by the solution-blending method with varied contents of bisulfonic SPOS polymer from 10 to 25 wt%. The S/SPOS composite membranes display superior conductivity owing to synergistic enhancement in the intermolecular chain interactions and the homogeneous strengthened transportation channels from main/side-chain bisulfonic acid interconnected networks. S/SPOS-15 shows better CE (96.5–98.5 %) and EE (84.7–69.9 %) than that of Nafion 212 (CE: 92.3–95.0 %, EE: 76.1–63.7 %) at 100–200 mA cm. Moreover, 600-cycled durability and 77.3 % EE at 150 mA cm, and 71.8 h self-discharge time demonstrate its improved reliable structure and cyclic stability. This provides a promising method to prepare high-performance and low-cost membranes with desirable conductivity by homogeneous structural regulation and molecular chain synergistic interactions.

中文翻译：

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全钒液流电池用主/侧链双磺化PEEK调控的均质强化超高电导率SPEEK膜

以1,3-丙磺酸盐为侧链，聚醚酮（PEEK）为反应物，通过后磺化和环化相结合的方法合成了具有主/侧链双磺化结构的梳状聚合物（SPOS）。开放接枝反应。以磺化PEEK为膜基质，采用溶液共混法制备了双磺酸SPOS聚合物含量为10~25 wt%的复合膜（S/SPOS）。由于分子间链相互作用的协同增强以及主/侧链双磺酸互连网络的均匀强化传输通道，S/SPOS复合膜表现出优异的电导率。在 100–200 mA cm 下，S/SPOS-15 显示出比 Nafion 212（CE：92.3–95.0 %，EE：76.1–63.7 %）更好的 CE（96.5–98.5 %）和 EE（84.7–69.9 %）。此外，600 次循环的耐久性和 150 mA cm 下的 77.3 % EE 以及 71.8 小时的自放电时间证明了其改进的可靠结构和循环稳定性。这提供了一种通过均匀结构调控和分子链协同相互作用制备高性能、低成本且具有理想电导率的膜的有前途的方法。