(234h) Rheological Behavior of Poly(vinyl alcohol) in Aqueous Solutions: Comparison and Assessment of Rheological Parameters Obtained By Empirical Correlations

Aqueous solutions of poly(vinyl alcohol) at different concentrations (4%, 6%, 8% and 10%) and temperatures (20°C and 35°C) have been used as model of fluid to assess the behavior of various rheological parameters using five models of empirical correlations, such as, Ferrys, Roberston-Stiff, Williamson, Ellis de Haven and Sisko. In this way, regression analysis on experimental data were developed to associate the rheological behavior with the model parameters. The rheological models chosen were compared in their coefficient of multiple correlation to fit the experimental data with the selected models. We observed through statistical analysis that each model presents different behaviors in relation to differential and dynamic viscosity. Further, it is shown that the choice of rheology model has influence on the prediction of the behavior of the aqueous solution of poly(vinyl alcohol) at different concentrations. Also, the results demonstrated that the precision of the calculated rheological parameters does not depend on the initial parameter values. This paper highlight the importance of understand the rheological behavior of a fluids through various models of empirical correlations and include directions for future research.