Study of Macromolecular Chain Dynamics in Polymer Complexes by Time-Resolved Fluorescence Spectroscopy
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- 作者：Veronika Pokorn¨¢ ; Drahom¨ªr Vyprachticky ; Jan Pecka and Franti?ek Mike?
- 关键词：Syndiotactic and isotactic poly(methyl methacrylate)s ; stereocomplex formation ; anthracene ; labeled polymers ; rotational correlation time ; limiting fluorescence anisotropy
- 刊名：Journal of Fluorescence
- 出版年：1999
- 出版时间：1999
- 年：1999
- 卷：09
- 期：1
- 页码：59-66
- 全文大小：945 KB
文摘
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.