Synthesis of the amphiphilic polyamide dendrons and their monolayer behavior

Amphiphilic dendrons having a hydrophilic tetra(ethylene oxide) at the focal point and hydrophobic oxydodecyl {-O-n(CH2)(11)CH(3)s: n=2, 4, 6} at terminals of the aromatic polyamide core were synthesized by the convergent method. These three dendrons formed monolayer films (L film) on the air-water interface. Dendron (10 c) under bar, having six alkyl chains, afforded the most stable L film among the 3 dendrons. Each dendron L film was transferred onto a hydrophilic silicon wafer and detailed micro structural analysis was performed by the atomic force microscopy (AFM). Although the homo L films had the similar morphology of the smooth surface, fiber-like domains, whose width were 0.5 similar to 1 mum, were observed in two cases of the mixing dendrons (10 a) under bar and (10 c) under bar and (10 b) under bar and (10 c) under bar. After further two dimensional pressing of these films, the fiber-like domains disappeared and same micro holes, whose diameter were about 1 mm, were seen on the films.