Nanoporous thin films from ionically connected diblock copolymers

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• 作者：Haizhou Yu^a ; Fran&#231 ; ois Stoffelbach^b ; ^c ; Christophe Detrembleur^b ; Charles-André ; Fustin^a ; ^{charles-andre.fustin@uclouvain.be} ; Jean-Fran&#231 ; ois Gohy^a ; ^{jean-francois.gohy@uclouvain.be}
• 关键词：Block copolymers ; Thin films ; Ionic interactions ; Self-assembly ; Blends
• 刊名：European Polymer Journal
• 出版年：2012
• 期刊代码：35_00143057
• 类别：ms
• 出版时间：May, 2012
• 卷：48
• 期：5
• 页码：940-944
• 文件大小：949 K

摘要

An ionically connected polystyrene-block-poly(ethylene oxide) diblock copolymer (PS^鈭?PEO) has been prepared by blending a PEO block functionalized by a dimethylamino group at one extremity with a sulfonic acid terminated PS block. Proton transfer occurs from the sulfonic acid to the dimethylamino group, resulting in the formation of an ion pair acting as a junction between the two polymer blocks. This copolymer was further used to prepare thin films with a cylindrical morphology consisting of PEO cylinders embedded in a PS matrix and oriented perpendicularly to the film surface. Nanoporous thin films with sulfonate groups on the pore walls have been finally obtained after solvent extraction of the PEO microphases. The presence of those sulfonate groups was evidenced by grafting a positively charged fluorescent dye on the pore walls.