Abstract
In this paper, we report a novel type of anion exchange membrane, which was synthesized by polysulfone modification with N-methyl diallylamine, whose allyl group enabled subsequent graft copolymerization of 4-vinylbenzyl chloride (VBC) and styrene (ST); quaternization was achieved with N-methylmorpholine (Mm). By controlling the amount of VBC and ST, a series of grafted side chain-type anion exchange membranes, MmOH-PSf-VS-x (x standing for VBC content), was prepared. Attributed to good microphase separation, the MmOH-PSf-VS-12 membrane exhibited a high conductivity of 33.71 mS cm−1 at 20 °C, which is 34% higher than that of the N-methylmorpholine quaternized polysulfone membrane without side chains (MmOH-PSf) at a similar ion exchange capacity (IEC). Moreover, the swelling resistance and mechanical properties of the membranes were also improved with the side chain grafting. Our work provides a new route to fabricate side chain grafted anion exchange membrane (AEM).
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