ON THE CORRELATION BETWEEN THE VISCOSITY OF PARTIALLY HYDROLYZED POLYACRYLAMIDE SOLUTION AND THE DIFFUSION-COEFFICIENT IN THE SEMIDILUTE CONCENTRATION REGIME
J. Kanatharana et al., ON THE CORRELATION BETWEEN THE VISCOSITY OF PARTIALLY HYDROLYZED POLYACRYLAMIDE SOLUTION AND THE DIFFUSION-COEFFICIENT IN THE SEMIDILUTE CONCENTRATION REGIME, Polymer engineering and science, 36(24), 1996, pp. 2986-2995
The solution viscosity of neutral polyacrylamide (PAM), the partially
hydrolyzed polyacrylamide (70% HPAM), and polyacrylic acid (PAA) were
measured concurrently with the apparent diffusion coefficient in the d
ilute and semidilute concentration regimes. We identified the scaling
relation eta - eta(s) = A/D in the semidilute regime, where eta is the
solution viscosity, eta(s) is the solvent viscosity, D is the coeffic
ient of the slow diffusion mode obtained from dynamic light scattering
, and A is a prefactor found to have a unique value of similar to 1.0
x 10(-8) cP cm(2)/s. The scaling relation as well as the prefactor are
independent of the the ionic strength, the solvent quality, the molec
ular weight, the charge density, the polyelectrolyte, and salt concent
rations. For the neutral PAM, the product [eta - eta(s)]D is proportio
nal to the polyelectrolyte concentration c(p), consistent with Rouse t
heory and previous experimental findings.