(4lh) Thin Cation Exchange Membranes through Thiol-Ene Click Polymerization

Advancements in membrane technology are essential for improving ion separation efficiency in water treatment and electrochemical systems. This study investigates the fabrication of cation exchange membranes using UV-activated thiol-ene click polymerization. The methodology creates uniform and robust membranes. By adjusting the ratios of vinyl to thiol and the inclusion of sulfonate vinyl groups, we have successfully engineered membranes capable of effectively modulating fixed charge concentration. Backbone chemistry is also modulated to tune the water uptake, with chemistry chosen to confer acid resistance. Furthermore, the rapid (~1 min) photopolymerization facilitates the formation of dense membranes with tunable thicknesses ranging from 20 to 150 microns, while interfacial photopolymerization enables formation of sub-micron-thick films. This control over thickness allows for direct modulation of cation transport; thinner membranes are instrumental in increasing transport rates, leading to improved separation efficiency. The combination of these properties—selectivity, control over swelling, acid resistance, and controlled thickness—may prove advantageous for challenging separation tasks.

Research Interests

1. Polymer Science
2. Ion Exchange Membranes
3. Bipolar Membrane Technology
4. Nanocomposite Membranes
5. Thin-Film Composite
6. Graphene-based Membrane
7. Environmental Membrane Applications
8. Membrane Simulation Techniques
9. Membrane Scale-up Processes
10. Fuel Cells