The slow dynamics of polymer chains involves extended spatial scales, exceeding many repeat units and making the behavior largely independent of chemical structure. This universality allows modeling of structural and dynamic properties without detailed consideration of the chemical structure. The Rouse and reptation models, for unentangled and entangled chains respectively, are reviewed with an emphasis on their ability to quantitatively describe experimental data. The chapter also discusses the coupling model, which makes various predictions based on general properties of relaxation in complex, correlated systems. Applications of polymers in which chain diffusion is the central mechanism are described.
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