Vu Anh, Sengupta Arijit, Freeman Emily, Qian Xianghong, Ulbricht Mathias, Wickramasinghe S Ranil
Ralph E Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, AR 72701, USA.
Bhabha Atomic Research Centre, Mumbai 400085, India.
Membranes (Basel). 2020 Sep 1;10(9):219. doi: 10.3390/membranes10090219.
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.
通过从100 kDa再生纤维素超滤膜的外表面接枝聚甲基丙烯酸2-羟乙酯链制备了磁响应超滤膜。采用表面引发原子转移自由基聚合反应接枝聚合物链。在不同密度的引发剂固定过程中，使用甘油作为孔填充溶剂来抑制从内部孔表面接枝。甘油抑制引发剂附着在孔表面。研究了长达四小时的聚合时间。将超顺磁性纳米颗粒共价连接到链端。使用牛血清白蛋白和葡聚糖作为模型溶质测定膜性能。接枝聚合物链密度和长度的增加导致渗透通量降低，表观截留系数增加。在振荡磁场中，接枝聚合物链的运动导致渗透通量降低，以及模型溶质的表观截留系数增加。
