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In situ ellipsometric thickness of PTBAEMA brushes immersed in aqueous solution as a function of solution pH. (■) Linear PTBAEMA brush (original dry thickness = 16 nm). (●) Same PTBAEMA brush uniformly cross-linked in THF using PPG-TDI at 20 °C. (⧫) Same PTBAEMA brush surface cross-linked in n-hexane using PPG-TDI at 20 °C.
