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首页> 外文期刊>Journal of Applied Polymer Science >Perfluorosulfonated ionomers membranes: Melt-processing and characterization for ion exchange applications
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Perfluorosulfonated ionomers membranes: Melt-processing and characterization for ion exchange applications

机译：全氟磺化离聚物膜：离子交换应用的熔融加工和表征

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摘要

Perflurosulfonated ionomers membranes with different ionic-exchange capacity were successfully fabricated via melt-extruding and casting of their -SO_2F precursors. A systematical investigation of the thermal stability, crystallinity, and rheological properties of the precursors was performed to secure their optimized processing conditions. The tensile properties of acid-form membranes are found to increase with base-hydrolysis time, where a tensile strength of 38.2 MPa is readily obtained after 24 h's base-hydrolysis. The content of -SO_2F or -SO_3H containing side-chains plays an important role in the thermal stability, rheological, and mechanical properties of the precursor or the acid-form membranes. The strong ionic interactions, attributed to the -SO_3H groups, lead to decreased crystallinity and tensile strength for different IEC membranes. The acid-form membranes exhibit good proton conductivity and low methanol crossover in comparison with reference Nafion membrane.
机译：通过熔融挤出和流延其-SO_2F前体，成功制备了具有不同离子交换容量的全氟磺化离聚物膜。对前体的热稳定性，结晶度和流变性进行了系统研究，以确保其优化的加工条件。发现酸型膜的拉伸性能随碱水解时间的增加而增加，在碱水解24小时后，很容易获得38.2 MPa的拉伸强度。含-SO_2F或-SO_3H的侧链的含量在前体或酸型膜的热稳定性，流变学和机械性能中起重要作用。归因于-SO_3H基团的强离子相互作用导致不同IEC膜的结晶度和拉伸强度降低。与参考型Nafion膜相比，酸型膜表现出良好的质子传导性和较低的甲醇穿透性。

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