Revisiting the colloidal fundamentals of water-dispersible polyesters: interactions and self-assembly of polymer nanoaggregates in water

Soft Matter
Sabina IslamOrlin D Velev

Abstract

Water-dispersible sulfopolyesters are a major class of film-forming and solution-modifying polymers, which are routinely used in applications such as inks, adhesives, coatings, and personal care products. Since these polyesters are designed to be used as waterborne dispersions, understanding their colloidal interactions in dispersions is critical for their application. By using a range of commercially available water-dispersible sulfopolyesters as a model system, we investigated the relationship between their molecular composition, colloidal interactions, and phase equilibria. We established how these polyesters undergo different molecular configurations and nanoaggregated states, depending on the nature of the liquid medium. For example, the polyesters are in a solvated molecular form in certain organic solvents, whereas they self-assemble into compact nanoaggregates in water. We found that the interactions of these nanoaggregates follow the classical DLVO theory of critical colloidal coagulation where the stability of these nanoparticles is extremely sensitive to multivalent electrolytes (i.e., Ccrit ∝ z-6). By using static, dynamic, and electrophoretic light scattering, we correlate their nanoscale intermolecular and interpa...Continue Reading

References

Oct 28, 1998·Biophysical Journal·B L NealA M Lenhoff
Jul 24, 2004·Journal of Colloid and Interface Science·C A GraciaJ R Rodríguez
Oct 21, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hossein FazliRamin Golestanian
Sep 18, 2015·Soft Matter·Brittany S Mertens, Orlin D Velev

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Methods Mentioned

BETA
light scattering
electrophoretic light scattering
dynamic light scattering
static light scattering

Software Mentioned

DLS
Malvern

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