Physical Characterization of a Commercial Suspoemulsion as a Reference for the Development of Suspoemulsions

Abstract

Viscoelasticity, low shear flow, microstructure, and physical stability of a commercial suspoemulsion pesticide are studied to serve as a point of reference for the development of new suspoemulsions. Creep compliance tests allow the zeroshear rate viscosity, g 0 , to be calculated. As expected, the values of g 0 decrease with temperature. The storage modulus is higher than the loss modulus until a crossover frequency, x*, which is located at the lower frequencies studied. The dynamic parameters decrease with higher temperature and x* increases in agreement with a faster relaxation mechanism. Multiple light scattering predicts the occurrence of a creaming destabilization process, whose kinetics depends on temperature. Rheological measurements are demonstrated to be a powerful tool to assist in the prediction of destabilization processes together with the multiple light scattering technique.

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