Surface morphologies and wetting properties of porous layer-by-layer film prepared using polyelectrolyte mixture of two average molecular weights
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In this study, layer-by-layer (LbL) assembly method was used to prepare hydrophobic surface. LbL films of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) were prepared. For PAA, PAA mixture of two average molecular weights, 100,000 and 1,500 g/mol was used. These LbL films were immersed in acidic solution followed by perfluorooctaonic acid treatment to prepare hydrophobic porous surface. The surface morphologies and wetting properties were influenced by PAA mixing ratio and acid treatment condition. At acid treatment condition of pH 2.4, water contact angle decreased as 1500 g/mol PAA increased. In contrast, at acid treatment condition of pH 2.0, water contact angle showed maximum when PAA of two molecular weights were properly mixed.