Influência da densidade de carga e da massa molar da poliacrilamida na reologia de sistemas microemulsionados

摘要

The knowledge of the rheological behavior of microemulsionated systems(SME) is of fundamental importance due to the diversity of industrial applications of thesesystems. This dissertation presents the rheological behavior of the microemulsionated systemformed by RNX 95/alcohol isopropyl/p-toulen sodium sulfonate/kerosene/distilled water withthe addition of polyacrylamide polymer. It was chosen three polymers of the polyacrylamidetype, which differ in molar weight and charge density. It was studied the addition of thesepolymers in relatively small concentration 0,1% in mass and maximum concentration of2,0%. It was made analysis of flow to determine the appearing viscosities of the SME andrheological parameters applying Bingham, Ostwald de Waale and Herschell-Buckley models.The behavior into saline environment of this system was studied for a solution of KCl 2,0%,replacing the distilled water. It was determined the behavior of microemulsions in relationwith the temperature through curves of flow in temperatures of 25 to 60ºC in variations of5ºC. After the analysis of the results the microemulsion without the addition of polymerpresented a slight increase in its viscosity, but it does not mischaracterize it as a Newtonianfluid. However the additive systems when analyzed with low concentration of polymeradjusted well to the applied models, with a very close behavior of microemulsion. The higherconcentration of the polymer gave the systems a behavior of plastic fluid. The results of thetemperature variation point to an increase of viscosity in the systems that can be related tostructural changes in the micelles formed in the own microemulsion without the addition ofpolymer