Polymer Brush-Functionalized Surfaces with Reversible, Precisely Controllable Two-Way Responsive Wettability
2013
Sun, Wei | Zhou, Shouxue | You, Bo | Wu, Limin
This paper is the first to present a facile method of fabricating intelligent surfaces with reversible, precisely controllable, two-way responsive wettability. The ABC-type block copolymers of tert-butyl methacrylate (tBMA), 2-hydroxyethyl methacrylate (HEMA), and 2-(diisopropylamino)ethyl methacrylate (DPAEMA) were synthesized through living radical polymerization mediated by a reversible addition–fragmentation chain transfer (RAFT) process and then grafted onto acyl chloride group-functionalized SiO₂ films to produce V-shaped PDPAEMA-b-PHEMA-b-PtBMA brush-grafted SiO₂ films. After hydrolysis, V-shaped polymer brushes with two arms of PDPAEMA and PMAA were produced. Because the PMAA and PDPAEMA segments were highly and independently responsive to pH values, the as-obtained films not only exhibited reversible, one-to-one, precisely controllable wettability but also two-way response behavior as pH value increased.
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