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Switching of Surface Properties with Polymer Brushes

Published online by Cambridge University Press:  01 February 2011

Manfred Stamm ,
Sergiy Minko ,
Evgeniy Goreshnik ,
Denis Usov  and
Alexander Sidorenko
Manfred Stamm
Affiliation:
Institut für Polymerforschung Dresden e.V., Hohe Straβe 6, 01069 Dresden, Germany
Sergiy Minko
Affiliation:
Institut für Polymerforschung Dresden e.V., Hohe Straβe 6, 01069 Dresden, Germany Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
Evgeniy Goreshnik
Affiliation:
Institut für Polymerforschung Dresden e.V., Hohe Straβe 6, 01069 Dresden, Germany Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
Denis Usov
Affiliation:
Institut für Polymerforschung Dresden e.V., Hohe Straβe 6, 01069 Dresden, Germany
Alexander Sidorenko
Affiliation:
Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
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Abstract

Switchable surfaces were fabricated by grafting of two different polymers: polystyrene (PS) and poly-2-vinylpyridine (PVP) onto the surface of Si-wafers. The binary brushes of various composition, molecular weight and grafting density were synthesized via free radical polymerization initiated by the azo-initiator covalently attached to the surface of Si-wafers. Investigations showed that the binary brushes are very sensitive to the surrounding media. After exposition to a solvent selective for PVP (ethanol, water + HCl) the surface becomes hydrophilic and the top of the layer is covered by PVP. After exposition to a solvent selective for PS (toluene) the surface becomes hydrophobic and the top of the layer is enriched with PS segments. Switching kinetics depends on grafting density and layer composition and varies from several seconds to several minutes at room temperature. Surface morphology of the layers switches as well as the wetting behavior. Results show that the layer reconstruction is reversible and can be repeated many times.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 629: Symposium FF – Interfaces, Adhesion and Processing in Polymer Systems , 2000 , FF9.3
Copyright
Copyright © Materials Research Society 2000

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References

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