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We use Brownian dynamics to show: For an isolated polymer coil in a shearfield, the Kirkwood-Riseman model for chain motion is qualitatively correct.Under the same circumstances the Rouse model for chain motion is qualitativelyincorrect. The models are qualitatively different. Kirkwood and Riseman saypolymer coils in a shear field perform whole-body rotation; in the Rouse modelrotation does not occur. Our simulations demonstrate that \emph{in shear flow}:Polymer coils rotate. Rouse modes are cross-correlated. The amplitudes andrelaxation rates of Rouse modes depend on the shear rate. Rouse's calculationonly refers to a polymer coil in a quiescent fluid, where there is no viscousdissipation. Application of the Rouse model to a polymer coil undergoing shearis invalid.

The Kirkwood-Riseman Polymer Model of Polymer Dynamics is Qualitatively Correct