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Formation of Honeycomb Structures and Superhydrophobic Surfaces by Casting a Block Copolymer from Selective Solvent Mixtures

2007; Wiley; Volume: 28; Issue: 3 Linguagem: Inglês

10.1002/marc.200600612

1521-3927

Pao‐Hsiang Tung, Shiao‐Wei Kuo, Kwang‐Un Jeong, Stephen Z. D. Cheng, Chih‐Feng Huang, Feng‐Chih Chang,

Surface Modification and Superhydrophobicity

Abstract Poly(vinyl phenol)‐ block ‐polystyrene (PVPh‐ b ‐PS) diblock copolymers are synthesized by sequential anionic polymerization with sec ‐butyl lithium as the initiator. The PVPh‐ b ‐PS diblock copolymer is cast (on a substrate) from several solvent mixtures that contain tetrahydrofuran/toluene ratios of 1:0.1, 1:1, and 1:2. After solvent evaporation the resulting films are characterized by SEM, TEM, and contact angle measurements. A honeycomb structure is fabricated from the vesicle structure at relatively low toluene contents. On the contrary, at relatively higher toluene contents, a micelle structure with porous microspheres is formed, which possesses higher surface roughness and results in film surface superhydrophobicity. The simple method described here that uses common/selective mixed solvents may be easily extended to prepare honeycomb structures and superhydrophobic surfaces simultaneously from a wide variety of block copolymers by carefully controlling the weight composition of the block copolymer and the selective solvent content. magnified image