Hydrophilic surface induced by pendant group of amphiphilic block copolymer

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A series of new amphiphilic block copolymers composed of water-soluble polymethacrylate and hydrophobic polydimethylsiloxane were synthesized by the living anionic polymerization and the coupling reaction. Those amphiphilic block copolymers possessed predicted molecular weights and compositions and narrow molecular weight distributions. Flat thin film was prepared by casting the block copolymer solution on a silicon wafer. Although the top surface of the film was covered by the hydrophobic polydimethylsiloxane segment under the vacuum conditions, rapid surface reconstruction occurred by treating the surface with water. After water treatment, the surface was covered with water-soluble polymethacrylate segment. Low glass transition temperatures of both segments and the hydrophilic polymethacrylate segment might play important roles to induce the surface reconstruction.