Abstract
The strong hydrophobicity of the chromophore pyrene combined with its ability to form an excimer has led to its use as a fluorescent replacement of the hydrophobes typically used in associative thickeners to prepare water-soluble polymers (WSPs) labeled with a small number of pyrene pendants to yield pyrene-labeled WSPs (Py-WSPs). Since the kinetics of excimer formation by diffusion are coupled, the fluorescence decays of the pyrene monomer and excimer can be analyzed globally to assess the fraction of pyrene labels that are isolated in solution and form excimer by diffusion and the fraction (f agg) of pyrenes that are pre-associated and form excimer instantaneously upon direct absorption of a photon. This review describes how new developments in the global analysis of the fluorescence decays of the pyrene monomer and excimer of Py-WSP aqueous solutions yield quantitative information about the associative strength f agg of Py-WSP. Most importantly for fluorescent mimics of associative thickeners, the review describes the viscoelastic behavior of a series of pyrene-labeled hydrophobically modified alkali swellable emulsion copolymers. Based on the viscoelasticity results, Py-WSPs appear to be excellent fluorescent mimics of non-fluorescent commercial associative thickeners, displaying similar behavior in terms of massive shear thinning and increase in zero-shear viscosity with polymer concentration. Consequently, the experiments described in this review provide a solid foundation for the characterization of the behavior of Py-WSP in aqueous solution by both fluorescence and rheology measurements.
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Acknowledgements
Although all former and present graduate students from the Duhamel laboratory contributed to some extent in the work described in this review, I would like to extend a special thanks to Drs. Sabesh Kanagalingam, Telmo Prazeres, Howard Siu, Christine Keyes, and Shaohua Chen on whose contributions this review was mostly based. Also, none of this work could have been carried out without the generous funding of the Natural Science and Engineering Research Council of Canada.
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Duhamel, J. (2016). Pyrene-Labeled Water-Soluble Macromolecules as Fluorescent Mimics of Associative Thickeners. In: Procházka, K. (eds) Fluorescence Studies of Polymer Containing Systems. Springer Series on Fluorescence, vol 16. Springer, Cham. https://doi.org/10.1007/978-3-319-26788-3_7
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