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Abstract: We consider equilibrium relaxation properties of the end-to-end distance andof principal components in a one-dimensional polymer chain model with nonlinearinteraction between the beads. While for the single-well potentials theseproperties are similar to the ones of a Rouse chain, for the double-wellinteraction potentials, modeling internal friction, they differ vastly from theones of the harmonic chain at intermediate times and intermediate temperatures.This minimal description within a one-dimensional model mimics the relaxationproperties found in much more complex polymer systems. Thus, the relaxationtime of the end-to-end distance may grow by orders of magnitude at intermediatetemperatures. The principal components whose directions are shown to coincidewith the normal modes of the harmonic chain, whatever interaction potential isassumed not only display larger relaxation times but also subdiffusivescaling.



Autor: S. Fugmann, I. M. Sokolov

Fuente: https://arxiv.org/







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