Thiol–Ene Photopolymerization for Highly Selective Anion Exchange Membranes with Sulfonium and Quaternary Ammonium Fixed Charges

Ion exchange membranes (IEMs) with high charge concentration and low water uptake are essential for efficient electrodialysis of hypersaline brines; yet, achieving both properties simultaneously remains challenging. Here, we employed thiol–ene photopolymerization to synthesize anion exchange membranes (AEMs) that exhibit low water uptake while maintaining high ion exchange capacities. The fabrication process involved a “click” reaction between …