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Effect of steric constraints on the physico‐electrochemical properties of sulfonated polyaromatic copolymers
Polymer International ( IF 3.2 ) Pub Date : 2020-08-07 , DOI: 10.1002/pi.6097
Nicolas Peressin 1 , Michael Adamski 1 , Steven Holdcroft 1
Affiliation  

The impact of incorporating additional steric restrictions into highly sterically encumbered sulfonated polyaromatic polymers was investigated. Copolymers possessing between 0 and 10% nonlinear ortho or meta biphenyl units in an otherwise linear para biphenyl‐containing sulfo‐phenylated poly(phenylene) were synthesized in yields >80% and evaluated on the basis of their physical and electrochemical properties. When incorporated into sulfonated copolymers in ≤5 mol%, ortho and meta linked biphenyl moieties reduced membrane swelling in water by up to 23 and 19 vol%, respectively, compared to strictly para biphenyl‐linked copolymers. Despite this, copolymers possessing nonlinear, biphenyl‐linked monomers displayed a decrease in proton conductivity and mechanical strength. This study reinforces the importance of considering restricted rotation, backbone flexibility, and chain entanglement in the design of polymers aimed at improving their physical and electrochemical properties. © 2020 Society of Industrial Chemistry

中文翻译:

位阻对磺化聚芳烃共聚物物理电化学性能的影响

研究了将其他空间限制引入高度空间阻碍的磺化聚芳族聚合物中的影响。合成具有0-10%非线性邻位联苯单元(否则为线性对位联苯基的磺基苯基化聚苯)的共聚物,收率> 80%,并根据其物理和电化学性能进行评估。当与≤5 mol%的磺化共聚物结合时,与严格对位相比,邻位连接的联苯部分分别减少高达23%和19%的水膜溶胀。联苯共聚物。尽管如此,具有非线性联苯连接单体的共聚物仍显示出质子传导性和机械强度下降。这项研究强调了在设计旨在改善其物理和电化学性能的聚合物设计中,考虑限制旋转,骨架柔性和链缠结的重要性。©2020工业化学学会
更新日期:2020-08-07
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