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

Research paper by George D. J. Phillies

Indexed on: 18 Jan '18Published on: 18 Jan '18Published in: arXiv - Physics - Soft Condensed Matter



Abstract

We use Brownian dynamics to show: For an isolated polymer coil, the Kirkwood-Riseman model for chain motion is qualitatively correct. The Rouse model for chain motion is qualitatively incorrect. The models are qualitatively different. Kirkwood and Riseman say polymer coils in a shear field perform whole-body rotation; in the Rouse model rotation does not occur. Our simulations demonstrate that in shear flow: Polymer coils rotate. Rouse modes are cross-correlated. The amplitudes and relaxation rates of Rouse modes depend on the shear rate. Rouse's calculation only refers to a polymer coil in a quiescent fluid, its application to a polymer coil undergoing shear being invalid.