Rheology of poly(acrylonitrile-acrylamide) solutions with different molecular weights

The rheological properties of poly(acrylonitrile-acrylamide) solutions with different molecular weights obtained by dissolving copolymers of acrylonitrile(AN) with acrylamide(AM) into dimethylsulfoxide(DMSO) were characterized by Non-Newtonian viscous index, activation energy of viscous flow, structure viscosity index and modulus. It is found that viscosities of the solutions with high molecular weight are more sensitive to shear rate and less sensitive to temperature than those with low molecular weight. The solutions with low molecular weight show better stability in repect of viscosity and elasticity than those with high molecular weight.