NON-NEWTONIAN FLOW OF STRUCTURED SYSTEMS. XXXII. VISCOELASTICITY OF THE SOLUTION OF HYDROPHOBICALLY MODIFIED HYDROXYETHYL CELLULOSE

摘要

The viscoelastic behavior of aqueous solutions of hydroxyethyl cellulose, which was hydrophobically modified by the addition of hydrophobic groups perpendicular to the polymer chain, is considered. The frequency dependences of the dynamic moduli are described using rheological equations obtained within the framework of a structural rheological model. Different types of oscillating flow are identified in the intervals of low, medium and high frequencies. The nature of rheological curves in these intervals corresponds to the solution structure state. It is shown that the change in the coefficients of the rheological equations with increasing concentration and temperature is explained within the framework of the structural model as a result of the destruction or formation of associates of macromolecules linked by entanglements or contacts of hydrophobic groups.