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Preparation of polysulfone-based block copolymer ultrafiltration membranes by selective swelling and sacrificing nanofillers

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 745-754页

作者： Shanshan Zhang Jiemei Zhou Zhaogen Wang Jianzhong Xia Yong Wang State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Institute for Advanced Study Shenzhen UniversityShenzhen 518060China Beijing OriginWater Membrane Technology Co. Ltd.Beijing 101407China

Selective swelling of block copolymers of polysulfone-b-poly(ethylene glycol)is an emerging strategy to prepare new types of polysulfone ultrafiltration ***,we prepared nanoporous polysulfoneb-poly(ethylene glycol)ultrafiltration membranes by selective swelling and further promoted their porosity and ultrafiltration performances by using CaCO_(3) nanoparticles as the sacrificial *** contents of CaCO_(3) nanoparticles were doped into the solution of polysulfone-b-poly(ethylene glycol),and thus obtained suspensions were used to prepare both self-supported and bi-layered composite *** swelling was performed on the obtained block copolymer structures in the solvent pair of ethanol/acetone,producing nanoporous membranes with poly(ethylene glycol)lined along pore *** CaCO_(3) nanoparticles dispersed in polysulfoneb-poly(ethylene glycol)were subsequently etched away by hydrochloric acid and the spaces initially occupied by CaCO_(3) provided extra pores to the block copolymer *** porosity of the membranes was increased with increasing CaCO_(3) content up to 41%,but further increase in the CaCO_(3) content led to partial collapse of the *** sacrificial CaCO_(3) particles provided extra pores and enhanced the connectivity between adjacent ***,the membranes prepared under optimized conditions exhibited up to 80%increase in water permeance with slight decrease in rejection compared to neat membranes without the use of sacrificial CaCO_(3) particles.

关键词： block copolymers selective swelling ultrafiltration CaCO_(3)nanoparticles sacrificial nanofillers

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