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Reversible pH-induced switching (a) static water CAs of PMMA-brush-modified PP membrane and film surfaces measured with 3 μL water droplets between (b) the fully protonated hydrophobic state (PMAA) under acidic conditions, a partially deprotonated polyelectrolyte state (P(MAA/MA–)) under neutral pH, and the fully deprotonated polyelectrolyte configuration (PMA–) under basic conditions. The error in the values is estimated to be below 2°.
