Department of Chemical Engineering and Materials Science and Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.
ACS Appl Mater Interfaces. 2010 Mar;2(3):847-53. doi: 10.1021/am900882t.
Nanoporous membranes containing monodisperse pores of 24 nm diameter are fabricated using poly(styrene-b-lactide) block copolymers to template the pore structure. A 4 mum thin film of the block copolymer is cast onto a microporous membrane that provides mechanical reinforcement; by casting the copolymer film from the appropriate solvents and controlling the solvent evaporation rate, greater than 100 cm(2) of a thin film with polylactide cylinders oriented perpendicular to the thin dimension is produced. Exposing the composite membrane to a dilute aqueous base selectively etches the polylactide block, producing the porous structure. The ability of these pores to reject dissolved poly(ethylene oxide) molecules of varying molecular weight matches existing theories for transport through small pores.
采用聚（苯乙烯-b-内脂）嵌段共聚物来模板化孔结构，制备了含有 24nm 直径单分散孔的纳米多孔膜。将 4 微米厚的嵌段共聚物薄膜铸到微孔膜上，以提供机械增强；通过从适当的溶剂中浇铸共聚物膜并控制溶剂蒸发速率，可以生产出大于 100cm2的薄膜，其中聚内脂圆柱垂直于薄膜的小尺寸定向排列。将复合膜暴露于稀碱溶液中选择性地刻蚀聚内脂嵌段，从而产生多孔结构。这些孔对不同分子量的溶解聚（氧化乙烯）分子的排斥能力与通过小孔的现有传输理论相匹配。
