以等离子体引发方法制备了聚(N-异丙基丙烯酰胺-聚乙二醇甲基丙烯酸酯)(P(NIPAAm-PEGMA))接枝的聚丙烯(PP)多孔膜.考察了改性膜水通量及表面润湿的温敏性质,并研究了其表面抗牛血清白蛋白(BSA)污染及自清洁性能.结果表明,聚乙二醇(PEG)侧链引入后,P(NIPAAm-PEGMA)保留了体积相转变性质,并在低临界溶解温度(LCST)上下均能展现良好的表面亲水性.得益于表面亲水性的改善,改性膜在过滤BSA溶液时的通量衰减率降低至18.8％.经简单的变温水清洗,BSA污染膜的水通量恢复率可达98.2％,且表面甚少污染物残留.P(NIPAAm-PEGMA)接枝链的亲水性及体积相转变是实现改性膜表面自清洁的原因.
Poly(N-isopropylacrylamide-poly (ethylene glycol) methacrylate) (P (NIPAAm-PEGMA)) was grafted on the surface of the porous polypropylene (PP) membrane by a plasma-initiated method.After investigation on thermosensitivities of water flux and surface wettability for the grafted membranes,both antifouling and self-cleaning performances were evaluated in detail.On the basis of a hydrophilic poly(ethylene glycol) (PEG) side chain,the P(NIPAAm-PEGMA) copolymer was confirmed to exhibit a significant volume-phase transition behavior similar to PNIPAAm,and be able to present good surface hydrophilicity at temperatures above its lower critical solution temperature (LCST).Therefore,the grafted membrane with good surface hydrophilicity could approach a lower flux decline of 18.8 ％ during filtration of the bovine serum albumin (BSA) solution.After a simple temperature-change water cleaning,the fouled membrane by BSA reaches a higher water flux recovery of 98.2 ％ with less BSA left on the surface.Both important characters of the volume-phase transition and good hydrophilicity of P (NIPAAm-PEGMA) graft chains are considered responsible for the self-cleaning performance of the grafted membrane surface.
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