We have demonstrated the growth of polymer brushes from a surface-textured thin urushiol film. Thermal imprinting was done on an initiator-immobilized thin urushiol film, and surface-initiated atom-transfer radical polymerization (ATRP) of [2-(methacryloyloxy)ethyl]trimethylammonium chloride (MTAC) was conducted from it. The obtained surface showed superhydrophilicity because of the nature of polyelectrolyte polymer brushes on the textured surface. Since thin urushiol film can form on a variety of substrates, the concept shown here could be a universal approach for surface modifications of substrates.
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