Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: (Hydro)gels and Elastomers
CPP 48.5: Talk
Friday, March 15, 2013, 10:45–11:00, H39
Evaluation of Fluorophore-Functionalized Thermoresponsive Copolymers for Sensor Applications — •Sahika Inal1, Jonas D. Kölsch2, Leonardo Chiappisi3, Dietmar Janietz4, Michael Gradzielski3, André Laschewsky2, and Dieter Neher1 — 1Inst. of Physics and Astronomy, Univ. of Potsdam, Germany — 2Dept. of Chemistry, Univ. of Potsdam, Germany — 3Stranski-Laboratory, Dept. of Chemistry, TU Berlin, Germany — 4Fraunhofer Inst. for Applied Polymer Research, Potsdam, Germany
Water-soluble polymers respond to changes in solution temperature by altering their conformation [1]. Although the fundamental mechanisms leading to these solubility transitions are comparable for the most studied LCST-type polymers, e.g., poly(N-isopropylacrylamide) (pNIPAm) and oligo(ethylene glycol) methacrylate (OEGMA) based copolymers, each type of polymer backbone has a peculiar solvation behavior and experiences different changes in the micro-environment upon phase transition. Here, we investigate the solubility transition behavior of NIPAm- and OEGMA-based copolymers bearing a dye-functionalized comonomer through their temperature-dependent photophysical properties. With the polarity-sensitive dye incorporated to the side chains, the emission spectra of these copolymers are expected to undergo similar changes upon phase transition. However, the two dye-labeled polymers exhibit rather different fluorescence responses, pointing to particular solvation properties of acryl amide and ethylene oxide based polymers, and rendering them useful for different sensing strategies. [1] V. O. Aseyev et al., Adv. Polym. Sci. 2006, 196, 85.