DYNAMICS OF A HIGH-MOLECULAR-WEIGHT POLYELECTROLYTE

We investigate the rheological behavior of semidilute salt-free soluti ons of a high molecular weight poly(acrylamide-co-sodium acrylate). Th e frequency dependence of the complex shear modulus G(omega) was meas ured in a large concentration range. Results give support to a recent model based on the scaling theory. It is found in particular that the zero-shear rate viscosity varies as C-3/2 in the entangled semidilute regime over 3 decades of concentration.