Improving the hydrophilic and antifouling properties of poly(vinyl chloride) membranes by atom transfer radical polymerization grafting of poly(ionic liquid) brushes. (16th October 2017)

• Record Type: Journal Article
• Authors: Cheng, Yuan‐Yuan; Du, Chun‐Hui; Wu, Chun‐Jin; Sun, Kai‐Xiang; Chi, Nian‐Ping
• Is Part Of: Polymers for advanced technologies. Volume 29:Number 1(2018)
• Page Start: 623
• Page End: 631
• Publication Date: 2017-10-16
• Subjects: antifouling property -- grafting modification -- hydrophilicity -- poly(ionic liquid) brushes -- PVC membrane; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pat.4172
• Languages: English
• ISSNs: 1042-7147

Abstract

Abstract : In this study, poly(1‐butyl‐3‐vinylimidazolium bromide) (PBVIm‐Br) was grafted onto the poly(vinyl chloride) (PVC) membrane surface via a 2‐step atom transfer radical polymerization (ATRP) reaction. Poly(2‐hydroxyethylmethacrylate) (PHEMA) was grafted onto the membrane surface by aqueous ATRP reaction; then, BVIm‐Br was introduced onto the surface of the PHEMA‐modified PVC membrane through traditional ATRP reaction. The analysis of surface chemistry confirmed the successful grafting of PHEMA and PBVIm‐Br on PVC membrane surface, and the grafting density (GD) of PBVIm‐Br gradually increased as the grafting time was prolonged. The modified membrane exhibited a positive charge and significantly enhanced surface hydrophilicity. The static water contact angle of the membrane surface decreased from 92.3° to 51.6° as the GD of the PBVIm‐Br brushes increased. Filtration experiments indicated that the water flux of the modified membrane increased with increasing GD, and their recovered fluxes were more than twice than the original. In addition, the total fouling ratio of the membranes decreased from 89% in M0 to 67% in M5, and most of the fouling was reversible as the GD of PBVIm‐Br brushes increased. These results indicated that the positive charged poly(ionic liquid) brushes featuring hydrophilic properties would have potential applications in membrane separation.