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Authors
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Minko, S. ; Usov, D. ; Goreshnik, E. ; Stamm, M.
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Title
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Environment-Adopting Surfaces with Reversibly Switchable Morphology
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Date
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02.03.2001
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Number
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9262
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Abstract
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Two-component polymer brushes (polystyrene and poly(2-vinylpyridine)) were synthesized by grafting from the surface of Si-wafers. The brushes are sensitive to the surrounding medium, and their morphology and composition of the top of a brush can be switched upon exposure to different solvents. Thus surface energetic states and roughness of the film can be precisely tuned. <br /><br />Schematic model describing the switching of a binary polymer brush. Initially, the brush is exposed to the selective solvent of polymer A (a). The chains of polymer A (light gray) approach a swollen conformation, while the chains of polymer B (dark gray) approach a collapsed conformation. The the layer is exposed to a common nonselective solvent (b). Chains of each polymer are swollen. Upon exposure of the layer to a solvent selective for polymer B, we obtain the morphology which is inverse to the first case (c). For all the cases, the lateral phase segregation results in microphase-separated domains rich in either A or B polymers with the average width being in th order of the chain size in theta solvents.
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Publisher
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Macromolecular Rapid Communications
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Wikidata
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Citation
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Macromolecular Rapid Communications 22 (2001) 206-211
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DOI
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https://doi.org/10.1002/1521-3927(200102)22:3<206::AID-MARC206>3.3.CO;2-R
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Tags
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monolayer films gold brushes thiols
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