Martschin Philipp, Atanasov Vladimir, Thiele Simon, Kerres Jochen
Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IET-2), Cauerstraße 1, 91058 Erlangen, Germany.
Department of Chemical and Biological Engineering, Friedrich Alexander Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany.
ACS Polym Au. 2024 Oct 14;4(6):492-497. doi: 10.1021/acspolymersau.4c00059. eCollection 2024 Dec 11.
Polyethersulfone (PSU) as a commercially available polymer offers many different opportunities for functionalization for diverse fields of application, for example, electrophilic substitutions like sulfonation and bromination or nucleophilic reactions such as lithiation. This study presents three different polysulfone derivatives, first functionalized by a lithiation reaction, followed by a reaction with carbonyl compounds containing pentafluorophenyl groups. In the last step, the pentafluorophenyl moieties of the modified PSU were sulfonated by thiolation and subsequent oxidation to sulfonic acid groups. Those novel PSU derivatives were characterized by NMR, DSC, TGA, GPC, and titration. Based on these ionomers, we show the fabrication of pure and acid-base blend membranes with promising proton conductivities. These novel sulfonic acid groups containing materials are potentially promising candidates for membranes or ionomers in electrochemical applications such as proton exchange membrane fuel cells (PEMFCs), proton exchange membrane water electrolysis (PEMWEs), or redox flow batteries (RFBs).
聚醚砜（PSU）作为一种市售聚合物，为不同应用领域的功能化提供了许多不同的机会，例如，磺化和溴化等亲电取代反应或锂化等亲核反应。本研究展示了三种不同的聚砜衍生物，首先通过锂化反应进行功能化，随后与含五氟苯基的羰基化合物反应。在最后一步中，改性PSU的五氟苯基部分通过硫醇化反应进行磺化，随后氧化为磺酸基团。这些新型PSU衍生物通过核磁共振（NMR）、差示扫描量热法（DSC）、热重分析法（TGA）、凝胶渗透色谱法（GPC）和滴定法进行表征。基于这些离聚物，我们展示了具有良好质子传导率的纯膜和酸碱共混膜的制备。这些含新型磺酸基团的材料在质子交换膜燃料电池（PEMFC）、质子交换膜水电解（PEMWE）或氧化还原液流电池（RFB）等电化学应用中作为膜或离聚物具有潜在的应用前景。
