Rheological Characterization of a Modified Taurate Acrylic Polymer for Skin Care

October 21, 2008 | Contact Author | By: Andrea Mitarotonda and Arianna Benetti, Lamberti SpA
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Keywords: inverse emulsion polymer | emulsion rheology | formulation stability | dynamic mechanical characterization | emulsifier-free formulations

Abstract: The rheology of a pre-neutralized, hydrophobically modified acrylic polymer was investigated by dynamic mechanical measurements using this methodological approach to establish its viscoelastic profile and stability in formulations. Properties of several polymer-containing emulsions were studied and their particle size distribution investigated by laser diffraction.

Measurement of shear stress and viscosity provides information concerning the flow properties of a system, such as its yield value. Most systems are viscoelastic; therefore, defining their flow properties as a function of shear rate is only a partial characterization of their rheological properties.

This raises important questions, such as: How can one separate the flow component from the elastic component of any given mixture? What happens in systems that are mostly elastic, as opposed to systems that are mostly viscous? How does a change in shear stress or strain affect the rheological properties of the system? Dynamic mechanical analysis is the key to answering these questions.