Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 211, Issue 9, Pages 1018-1025Publisher
WILEY-BLACKWELL
DOI: 10.1002/macp.200900533
Keywords
gels; refractive index; stimuli-sensitive polymers; swelling; thin films
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1259, KN 224/18-1, 548592 AN 726/1-1]
- Qiagen/BMBF [03X0014D]
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Surface-attached, photo-crosslinked gel films of a N-isopropylacrylamide copolymer were investigated in ethanol/water mixtures using a combination of surface plasmon resonance/optical waveguide spectroscopy with reversed WKB analysis. The solvent quality of the pure good solvents drops in their mixture and this co-nonsolvency effect shifts the transition temperature (T(c)) in the mu m-thin gel films from 32.8 degrees C in pure water to 29.7 degrees C with only 0.25 vol.-% ethanol. Between 20 and 70% ethanol and >10 degrees C (the practical temperature limit) the layers existed only in the collapsed state. A reentrant T(c) of 40.2 degrees C was found at 70% ethanol while at higher ethanol volume fraction no T(c) could be recorded.
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