Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 211, Issue 7, Pages 761-767Publisher
WILEY-BLACKWELL
DOI: 10.1002/macp.200900596
Keywords
electrochemically triggered polymerization; grafting; hydrogel film; reversible addition-fragmentation chain transfer polymerization; surface morphology
Categories
Funding
- European Graduate School on Microstructural Control in Radical Polymerization
- Deutsche Forschungsgemeinschaft [JO 278/12-1]
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Thin hydrogel films of the thermoresponsive polymer poly(N-isopropylacrylamide) (pNIPAm) were prepared by electrochemically triggered reversible addition-fragmentation chain transfer (RAFT) polymerization. Two different RAFT agents were employed, which work in either acidic or basic solution. In both cases, addition of RAFT agents had an influence on the thickness and the surface morphology of the films. At low concentration, the polymerization efficiency increased. At high concentration, the efficiency decreased at acidic pH, while it remained constant under basic conditions. Neither RAFT agent displayed electrochemical activity on its own, but they did modify the electrochemical behavior of the initiator. The addition of RAFT agent strongly enhances the homogeneity of the hydrogel surfaces, which presumably is due to a reduced electrochemically triggered RAFT polymerisation amount of microgel formation.
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