FINITELY EXTENSIBLE BEAD SPRING CHAINS IN TIME-DEPENDENT SHEAR FLOWS

The configurational and rheological properties of bead spring chains i n time-dependent shear flows are calculated. The finite extensibility is incorporated through the constraint of constant contour length of t he chain. Start-up of shear flow yields a stress overshoot, whereas os cillatory shear flow yields the same frequency dependence of the dynam ic moduli as the simple bead spring model. The results show that finit e extensibility can lead to non-linear rheological behavior of dilute polymer solutions. The influence of preaveraged hydrodynamic interacti on on the obtained results is discussed.