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Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 27: POSTER Polymer Physics and Materials

CPP 27.49: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

ATRP-Synthesis of Polymer Brushes in aqueous Solution for Silicon Surface Modification — •Sebastian Nett1, Gunnar Kircher1, Markus Wolkenhauer1, and Jochen S. Gutmann1,21Max Planck Institute for Polymer Research, Ackermannweg 11, D-55128 Mainz — 2Institute for Physical Chemistry, Johannes Gutenberg University, Welderweg 11, D-55099 Mainz

The aim of this project is the chemical modification of Micromechanical Sensors (MMS) for the use as temperature and chemical probes. The silicon-surface properties are changed by growing polymer brushes on top of the MMS.
Our approach make use of a Nanoplotter (GESIM) to "print" microstructures on micro cantilever sensors. The Nanoplotter is optimized for water as system liquid. Therefore the synthesis of the covalently bound polymer brushes has to be in aqueous solution. We performed ATRP (Atom Transfer Radical Polymerization) -Synthesis of PNIPAM (Poly(N-Isopropylacrylamide))in a mixture of H2O and DMF both in bulk solution and small droplets. Ellipsometry measurements provided the characterization of the film. The brush thickness varies with molecular weight from 5 to 40 nm.
The synthesized PNIPAM shows a LCST (lower critical solution temperature) behavior at a critical temperature of  32C.

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