Superhydrophobic surfaces based on poly(methyl methacrylate) (PMMA) with flower-like structures were prepared by controlling the aminolysis reaction of surface ester groups and the surface morphology of PMMA. The effects of the aminolysis time and the processing temperature in stearic acid solution on the surface wettability and surface morphology were examined in detail. The combination of rough surface morphology and the presence of hydrophobic carbon chains on the top layer was responsible for the superhydrophobicity. (c) Koninklijke Brill NV, Leiden, 2008