Study of Macromolecular Chain Dynamics in Polymer Complexes by Time-Resolved Fluorescence Spectroscopy |
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Authors: | Veronika Pokorná Drahomír Vyprachtický Jan Pecka František Mikeš |
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Institution: | (1) Institute of Macromolecular Chemistry, Academy of Sciencies of the Czech Republic, Heyrovský Sq. 2, 162 06 Prague, Czech Republic |
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Abstract: | Poly(methyl methacrylate)s labeled with the anthracene fluorophore were prepared by free radical, anionic, and coordination polymerization yielding atactic and syndiotactic polymers. Unlabeled isotactic poly(methyl methacrylate) was prepared by anionic polymerization. Time-resolved fluorescence spectroscopy was used to study polymer association in solution. The time-dependent decays of fluorescence anisotropy show that stereocomplexation causes an increase in rotational correlation times of anthracene fluorophores both embedded in the polymer backbone and attached at the end of the side chain of polymer molecules. The rotational correlation time of anthracene fluorophore in dimethylformamide as a part of stereocomplex is 11.9 and 30 ns in the side chain and embedded in the polymer backbone, respectively, and shorter than 3 ns in noncomplexing solvent. |
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Keywords: | Syndiotactic and isotactic poly(methyl methacrylate)s stereocomplex formation anthracene-labeled polymers rotational correlation time limiting fluorescence anisotropy |
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