SANTOS GARCÍA, JENIFER, Trujillo, Luis A. , Calero, Nuria , Alfaro, Maria C. , Munoz, Jose
Si
Chem. Eng. Technol.
Article
Científica
2.175
0.722
01/11/2013
000328135000008
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 zero-shear rate viscosity, (0), to be calculated. As expected, the values of (0) decrease with temperature. The storage modulus is higher than the loss modulus until a crossover frequency, *, which is located at the lower frequencies studied. The dynamic parameters decrease with higher temperature and * 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.
Pesticide; Physical stability; Rheology; Suspoemulsion; Viscosity