Influence of ionic liquid-like cationic pendants composition in cellulose based polyelectrolytes on membrane-based CO2 separation

Cellulose acetate (CA) is an attractive membrane polymer for CO2 capture market. However, its low permeability hampers application as part of a most relevant types containing feeds. This work investigates the enhancement CA separation performance by incorporating ionic liquid-like pendants (1-methylimidazol, 1-methylpyrrolidine, and 2-hydroxyethyldimethylamine (HEDMA) on backbone. These CA-based polyelectrolytes (PEs), synthesised covalent grafting cationic with anion metathesis, were characterised NMR, FTIR, DSC/TGA, processed into thin-film composite membranes. The in CO2/N2 mixed-gas permeation experiments shows decrease N2 initial then gradual increase selectivity increasing HEDMA content. amount attached to backbone determines overall process bifunctional PEs. indicates that hydroxy-substituted alter interactions between PEs network permeating molecules, suggesting possibilities further improvements.