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CPP: Chemische Physik und Polymerphysik

CPP 15: POSTER: Polymers and Biomaterials

CPP 15.42: Poster

Dienstag, 9. März 2004, 17:00–19:00, B

Formation of thin PNIPAM layers on a metal surface by electrochemically initiated free-radical polymerisation — •Helke Reinhardt¹, Ashok Kumar², Andreas Bund², and Diethelm Johannsmann¹ — ¹Institut fuer Physikalische Chemie, TU Clausthal, Arnold-Sommerfeld-Str. 4, D-38678 Clausthal-Zellerfeld — ²Institut fuer Physikalische Chemie und Elektrochemie, TU Dresden, Mommsenstrasse 13, D-01062 Dresden

The aim of this work is the formation of thin PNIPAM layers on metal electrodes. A quartz crystal microbalance was used for monitoring the polymerisation.

The polymerisation of NIPAM crosslinked with bisacrylamide was initiated by metallic ions from sacrificial anodes in the presence of peroxydisulfate. The formation of the anion radicals SO₄^{• −} as initiator and the consequent polymerisation is therefore controlled by the current flowing through the system. Since polymerisation starts at the electrode the gel forms at the surface. We now concentrate on improving adhesion properties.

Depending on the temperature of polymerisation and degree of crosslinking, PNIPAM layers show a lower critical solvent temperature (LCST) behaviour and as a consequence, the formation of a lateral structure.

Layer properties are investigated as a function of temperature, of applied voltage, degree of crosslinking, of monomer concentration, and other system parameters.