Document Type
Article
Publication Date
9-2020
Keywords
atom transfer radical polymerization; concentration polarization; flux; fouling; rejection
Abstract
Magnetically responsive ultrafiltration membranes were prepared by grafting poly(2-hydroxyethyl methacrylate) chains from the outer surface of 100-kDa regenerated cellulose ultrafiltration membranes. Surface-initiated atom transfer radical polymerization was used to graft the polymer chains. Grafting from the internal pore surface was suppressed by using glycerol as a pore-filling solvent during initiator immobilization at varied densities. Glycerol suppresses the initiator attachment to the pore surface. Polymerization times of up to four hours were investigated. Superparamagnetic nanoparticles were covalently attached to the chain end. Membrane performance was determined using bovine serum albumin and dextran as model solutes. Increasing the grafted polymer chain density and length led to a decrease in the permeate flux and an increase in the apparent rejection coefficient. In an oscillating magnetic field, movement of the grafted polymer chains led to a decrease in the permeate flux, as well as an increase in the apparent rejection coefficient of the model solutes.
Citation
Vu, A., Sengupta, A., Freeman, E., Qian, X., Ulbricht, M., & Wickramasinghe, S. (2020). Tailoring and Remotely Switching Performance of Ultrafiltration Membranes by Magnetically Responsive Polymer Chains. Membranes, 10, 219. https://doi.org/10.3390/membranes10090219
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
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