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 polysulfone-b-poly(ethylene glycol) ultrafiltration membranes by selective swelling and further promoted their porosity and ultrafiltration performances by using CaCO₃ nanoparticles as the sacrificial nanofillers. Different contents of CaCO₃ 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 CaCO₃ nanoparticles dispersed in polysulfone-b-poly(ethylene glycol) were subsequently etched away by hydrochloric acid and the spaces initially occupied by CaCO₃ provided extra pores to the block copolymer layers. The porosity of the membranes was increased with increasing CaCO₃ content up to 41%, but further increase in the CaCO₃ content led to partial collapse of the membrane. The sacrificial CaCO₃ 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 CaCO₃ particles.

聚砜-b-聚乙二醇嵌段共聚物的选择性溶胀是制备新型聚砜超滤膜的新兴策略。本文中，我们通过选择性溶胀制备了纳米多孔聚砜-b-聚乙二醇超滤膜，并以CaCO ₃纳米颗粒为牺牲纳米填料，进一步提高了其孔隙率和超滤性能。将不同含量的CaCO ₃纳米颗粒掺杂到聚砜b溶液中-聚（乙二醇）和由此获得的悬浮液用于制备自支撑和双层复合结构。在乙醇/丙酮的溶剂对中对获得的嵌段共聚物结构进行选择性溶胀，制得沿孔壁排列有聚乙二醇的纳米多孔膜。随后，分散在聚砜-b-聚乙二醇中的CaCO ₃纳米颗粒被盐酸蚀刻掉，最初被CaCO ₃占据的空间为嵌段共聚物层提供了额外的孔。膜的孔隙率随CaCO ₃含量增加至41％而增加，但CaCO ₃进一步增加含量导致膜部分塌陷。牺牲CaCO ₃颗粒提供了额外的孔并增强了相邻孔之间的连通性。因此，与不使用牺牲性CaCO ₃颗粒的纯净膜相比，在优化条件下制备的膜表现出高达80％的水渗透率增加，而截留率略有下降。