Abstract
The rheological properties of dilute and semidilute solutions (viscosity) and physical gels (elasticity modulus) of hydrophobically modified self-associated binary polymers (formed by micellar polymerization of acrylamide and methyl methacrylate with side hydrophobic groups (HG) containing 9, 12 and 18 C-atoms), and terpolymers (the same monomers and a charged component — sodium acrylate) are studied. The dependences of properties on the length, form (linear or branched) and the number of HG and charges is established. It is shown that a very small number of linear HG leads to a considerably higher solution viscosity, starting at a smaller concentration compared with the effects of a larger number of branched HG. Solutions of terpolymers of concentration 2–3 wt % form physical gels that are thixotropic. After dilution, the polymers suddenly form gels at certain concentrations without the preliminary stage of viscosity growth
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