Functionalized Membranes for Sorption, Separation, and Reaction: An Overview

Ladhe, Abhay R.; Xu, Jian; Hollman, Aaron M.; Smuleac, V.; Bhattacharyya, Dibakar

doi:10.1016/b978-0-08-093250-7.00009-8

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2024

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Microfiltration membranes functionalized with multiple styrenic homopolymer and block copolymer grafts

Shethji

Ritchie

2015

J of Applied Polymer Sci

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The pores of microfiltration polyethersulfone membranes have been functionalized with homopolymer and block copolymer grafts through sequential cationic polymerization of styrene and substituted styrene monomers, namely 4-chloromethylstyrene and 4-ethoxystyrene.1 H NMR characterization confirmed successful incorporation of polymeric grafts at different stages of functionalization. The functionalized membrane showed a 90% decrease in membrane permeability compared to the raw membrane indicating the presence of polymeric chains in the membrane flow path. Functionalized membranes have as many as 125 repeat units per chain equating to an ion-exchange capacity (IEC) of 4.9 meq/g, representing 92% of the theoretical IEC of an ion-exchange resin. A pseudo-first-order kinetic equation correlated well (R 2 $ 0.99) with the experimental kinetic data of formation of polymeric grafts.Polymer growth studies showed that at lower initiator surface density (initiator contact time <135 min), graft length and IEC were impacted by monomer feed concentration and initiator contact time.

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