Form of the Reduced Viscosity Function

Although taking place over a somewhat wider range of c[ij], this transition parallels the variation of JeR from Zimm-like to Rouse-like behavior at low concentrations (15). It also supports the contention (Section 5) that coil overlap is the principal structural variable affecting viscoelastic behavior at low to moderate concentrations. 

Judged by the superposability of viscosity-shear rate data on the same master curve for a variety of polymers [polystyrene (155) (Fig. 8.10), poly(a-methyl 

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