DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2004 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

CPP: Chemische Physik und Polymerphysik

CPP 15: POSTER: Polymers and Biomaterials

CPP 15.42: Poster

Tuesday, March 9, 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 Johannsmann11Institut 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.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2004 > Regensburg