Shin Dongwon, Nugraha Adam F, Wijaya Farid, Lee Sojeong, Kim Eunyoung, Choi Jieun, Kim Hyoung-Juhn, Bae Byungchan
Fuel Cell Laboratory, Korea Institute of Energy Research Daejeon 34129 Republic of Korea
Department of Renewable Energy Engineering, University of Science and Technology Daejeon 34113 Republic of Korea.
RSC Adv. 2019 Jul 5;9(37):21106-21115. doi: 10.1039/c9ra03888d.
Despite our ability to post-functionalize poly(arylene ether sulfone) multi-block copolymers by rapid chloromethylation, bromination, or acylation, with degrees of functionalization that exceeded 70% in a few hours, materials formed during attempts to prepare fully post-functionalized multi-block copolymers are poorly soluble due to undesired side reactions, such as crosslinking or di-bromination. In particular, clustered reactive sites in multi-block copolymers increase the chance of self-reactions between polymer backbones, resulting in the formation of by-products. On the other hand, the authentic multi-block copolymer with good solubility and high molecular weight was successfully synthesized using functionalized monomers. Despite its low ion-exchange capacity, the resulting multi-block copolymer outperformed the commercial FAA-3-30 membrane in terms of anion conductivity, even under low relative humidity conditions.
尽管我们能够通过快速氯甲基化、溴化或酰化对聚（亚芳基醚砜）多嵌段共聚物进行后功能化，在几小时内功能化程度超过70%，但在尝试制备完全后功能化多嵌段共聚物过程中形成的材料由于不期望的副反应（如交联或二溴化）而溶解性很差。特别是，多嵌段共聚物中聚集的反应位点增加了聚合物主链之间自反应的机会，导致副产物的形成。另一方面，使用功能化单体成功合成了具有良好溶解性和高分子量的正宗多嵌段共聚物。尽管其离子交换容量较低，但即使在低相对湿度条件下，所得多嵌段共聚物在阴离子传导率方面也优于商业FAA-3-30膜。
