Scaling of the shear viscosity of the system polystyrene-cyclohexane in the critical region

The shear viscosity of the system polystyrene-cyclohexane was measured along the isochores near the critical concentration. The value of the critical exponent for the shear viscosity (${\phi }_{\eta }=0.029\mathrm{}\pm 0.003$) is obtained by analyzing the results from the viewpoint of multiplicative renormalization of transport coefficients. In addition, it is shown that the shear viscosity satisfies scaling-law relations and the pseudospinodal generalization previously established for fluids and binary mixtures.