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    Nanoporous Structures from PS-b-PMMA-b-PtBA Triblock Copolymer and Selective Modification for Ultrafiltration Membranes

    Year: 2019

    Journal: ACS Appl. Polym. Mater., Volume 1, MAR, page 584–592

    Authors: Park, Sungmin; Jun, Taesuk; Yoon, Hye Rin; Jo, Seongjun; Kim, Jong Hak; Ryu, Chang Y.; Ryu, Du Yeol

    Organizations: NRF - Ministry of Science, ICT & Future Planning (MSIP) [2017R1A2A2A05001048, 2017R1A4A1014569]; Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20163030013960]; Ministry of Trade, Industry & Energy (MOTIE), Korea; NSF (DMR Polymers)National Science Foundation (NSF) [1308617]

    Keywords: triblock copolymer; self-assembly; hydrolysis; nondegradative nanopore generation; functional membrane

    A simple approach to fabricating nanoporous structures and their functionality is demonstrated using a triblock copolymer of polystyrene-b-poly(methyl methacrylate)-b-poly(tert-butyl acrylate) (PS-b-PMMA-b-PtBA), where a continuous-type morphology is set in PS matrix to form the cylinders consisting of the PMMA and minor PtBA blocks. For directional and uniform nanochannels at the interfaces, a perpendicular orientation of cylinders was exploited near two interfaces of air/polymer and polymer/neutral substrate, sandwiching the random orientation of cylinders in the interior of the film. Nondegradative, selective swelling-deswelling process of cylindrical (PMMA-b-PtBA) blocks generates nanopores as an effective route to precisely tune the pore size. Further, a simple hydrolysis of tBA units functionalizes the nanopore surfaces and walls into poly(acrylic acid) layers. We demonstrate the pH-responsive water permeability of nanoporous membranes and their active switching with respect to biomolecules such as bovine serum albumin (BSA), suggesting a feasible functional platform to fabricate a stimuli-responsive ultrafiltration membrane using a tunable multiblock copolymer.
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