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

作　　者：Shanshan Zhang Jiemei Zhou Zhaogen Wang Jianzhong Xia Yong Wang 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,China [2]Institute for Advanced Study,Shenzhen University,Shenzhen 518060,China [3]Beijing OriginWater Membrane Technology Co.,Ltd.,Beijing 101407,China

出　　处：《Frontiers of Chemical Science and Engineering》2022年第5期745-754,共10页化学科学与工程前沿（英文版）

基　　金：support from the National Natural Science Foundations of China(Grant Nos.21776126 and 21825803)are gratefully acknowledged.

摘　　要：Selective swelling of block copolymers of polysulfone-b-poly(ethylene glycol)is an emerging strategy to prepare new types of polysulfone ultrafiltration membranes.Herein,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 nanofillers.Different 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 structures.Selective 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 walls.The 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 layers.The 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 membrane.The sacrificial CaCO_(3) particles provided extra pores and enhanced the connectivity between adjacent pores.Consequently,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 

分 类 号：TQ051.893[化学工程]