Influence of hydrophobe fraction content on the rheological properties of hydrosoluble associative polymers obtained by micellar polymerization

Enrique J. Jiménez-Regalado, Elva B. Hernández-Flores
2012 E-Polymers  
AbstractThe synthesis, characterization and rheological properties in aqueous solutions of water-soluble associative polymers (AP's) are reported. Polymer chains consisting of water-soluble polyacrylamides, hydrophobically modified with low amounts of N,N-dihexylacrylamide (1, 2, 3 and 4 mol%) were prepared via free radical micellar polymerization. The properties of these polymers, with respect to the concentration of hydrophobic groups, using steady-flow and oscillatory experiments were
more » ... riments were compared. An increase of relaxation time (TR) and modulus plateau (G0) was observed in all samples studied. Two different regimes can be clearly distinguished: a first unentangled regime where the viscosity increase rate strongly depends on hydrophobic content and a second entangled regime where the viscosity follows a scaling behavior of the polymer concentration with an exponent close to 4.
doi:10.1515/epoly.2012.12.1.96 fatcat:s4ct2thq4vaf3p22svgvmx4kfy