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Switching and structuring of binary reactive polymer brush layers
Author(s) -
Ionov Leonid,
Stamm Manfred,
Minko Sergiy,
Hoffmann Frank,
Wolff Thomas
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450626
Subject(s) - polystyrene , polymer , chromophore , materials science , solvent , copolymer , polymer chemistry , chemical engineering , polymer brush , contact angle , wafer , chemistry , photochemistry , nanotechnology , organic chemistry , polymerization , composite material , engineering
Switchable binary polymer brushes grafted to Si‐wafers were prepared from hydrophilic and hydrophobic polymer components. When exposed to solvents, either the hydrophobic or the hydrophilic component extends in to the liquid phase, depending on the polarity of the solvent. The hydrophilic component was poly‐2‐vinylpyridine; the hydrophobic component was made photocrosslinkable in that a polystyrene copolymer containing a photodimerizing chromophore was used. In this system surfaces differing in water contact angle between 60° and 100° can be produced by variation of the solvent. The chromophore was phenylindene, which forms crosslinks upon direct UV‐irradiation. Therefore, the polystyrene component can be fixed in the extended or collapsed state. It will be shown that by irradiation through an appropriate mask, surfaces can be structured and the structures fixed. In both the systems structural patterns differing in surface properties were produced and fixed photochemically.