期刊
MACROMOLECULAR SYMPOSIA
卷 210, 期 -, 页码 229-235出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/masy.200450626
关键词
networks; photochemistry; stimuli-sensitive polymers surfaces; thin films
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 60degrees and 100degrees 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.
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