Interactions between hydrophobically modified alkali-swellable emulsion polymers and sodium dodecyl sulfate probed by fluorescence and rheology

The Journal of Physical Chemistry. B
Shaohua ChenJean Duhamel

Abstract

The interactions between a pyrene-labeled hydrophobically modified alkali-swellable emulsion (Py-HASE) polymer and the anionic surfactant sodium dodecyl sulfate (SDS) in aqueous solution were investigated with a fluorometer, a rheometer, and a combination of both instruments to probe the fluorescence of the polymer while the solution was being sheared. Different amounts of SDS were added to two solutions with Py-HASE concentrations of 8 and 57 g/L. The pyrene monomer and excimer decays of the Py-HASE solutions were acquired and globally fitted according to the fluorescence blob model (FBM) and the model free (MF) analysis. Both models yielded the same molar fractions of pyrenes that were isolated, aggregated, or forming excimer by diffusion. The average number of pyrenes per micelle, <n>, was determined according to the FBM and found to equal 2.0 at the SDS concentration corresponding to a maximum in solution viscosity. For a Py-HASE concentration of 57 g/L, the solution viscosities at different SDS concentrations were measured from the Newtonian plateau regions and were found to peak at an SDS concentration of 11 mM. The steady-state fluorescence spectra were acquired at SDS concentrations of 0.1, 6.0, 11.1, and 17 mM while th...Continue Reading

References

Jul 15, 1989·Physical Review. B, Condensed Matter·N E Glass, D Rogovin
Dec 21, 2005·Chemical Society Reviews·David Parker, Robert Eagling
Dec 21, 2006·Accounts of Chemical Research·Jean Duhamel
Mar 17, 2011·The Journal of Physical Chemistry. B·Shaohua ChenMitchell A Winnik

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Citations

Feb 6, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Qian ZhangJean Duhamel

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