A highly stable aliphatic backbone from visible light-induced RAFT polymerization for anion exchange membranes
A highly stable aliphatic backbone from visible light-induced RAFT polymerization for anion exchange membranes
复制标题
用于阴离子交换膜的可见光诱导 RAFT 聚合的高度稳定的脂肪族主链
DOI：
10.1039/d1py00867f
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发表时间：
2021
影响因子：
4.6
通讯作者：
Qian Jiasheng
中科院分区：
文献类型：
--
作者：
Ge Qianqian;Wang Guangzu;Zhu Xiang;Yu Weisheng;Zhou Jiahui;Wu Bin;Liu Yahua;Zheng Zhengzhi;Yang Zhengjin;Qian Jiasheng
聚烯烃阴离子交换膜近年来得到了越来越多的研究，但在简单、无金属的条件下获得相对分子质量可控、化学稳定性高的聚烯烃仍然是一个关键的挑战。在这里，我们展示了一种新的策略，利用可见光诱导的可逆加成-断裂链转移聚合(VIS-RAFT)来制备具有高碱性稳定性的聚2-氯乙基乙烯基醚(PCEVE)。通过这种策略，我们可以通过“开/关”的光过程来控制PCEVE的相对分子质量。聚2-氯乙基乙烯基醚的季胺化反应得到了具有明确微相分离形态的季节化聚2-氯乙基乙烯基醚(PQEVE)膜，在30℃时的高氯离子电导率为26.1ms cm−1，在80℃时显著降低了1.2%的水膨胀率。
Polyolefin-based anion exchange membranes have recently been increasingly studied, but obtaining polyolefins with controllable molecular weights and high chemical stability under facile and metal-free conditions remains a critical challenge. Here, we demonstrate a novel strategy of exploiting visible light-induced reversible addition–fragmentation chain transfer polymerization (Vis-RAFT) for the preparation of poly(2-chloroethyl vinyl ether) (PCEVE), which exhibits high alkaline stability. With this strategy, we can control the molecular weight of PCEVE by an “on/off” light procedure. The quaternization of PCEVE yields quaternized poly(2-chloroethyl vinyl ether) (PQEVE) membranes with a well-defined microphase-separated morphology, a high chloride conductivity of 26.1 mS cm−1 at 30 °C, and a significantly reduced water swelling of 1.2% at 80 °C. We anticipate that this strategy can be a potent alternative to metal-catalysed coordination polymerization or metathesis polymerization in preparing high molecular weight polyolefins for membrane applications.