Entangled-like Chain Dynamics in Non-entangled Polymer Blends with Large Dynamic Asymmetry

Details Entangled-like Chain Dynamics in Non-entangled Polymer Blends with Large Dynamic Asymmetry Entangled-like Chain Dynamics in Non-entangled Polymer Blends with Large Dynamic Asymmetry

2007-08-22

arxiv.org/abs/0708.3050v2

Physics

Condensed Matter

Soft Condensed Matter

Version 2. Major changes. New data

Scientific paper

10.1103/PhysRevLett.100.126001

We discuss simulations of a simple model for polymer blends in the framework of the Rouse model. At odds with standard predictions, large dynamic asymmetry between the two components induces strong non-exponentiality of the Rouse modes for the fast component. Despite chains being much shorter than the entanglement length, it also induces dynamic features resembling a crossover to entangled-like chain dynamics. This unusual behavior is associated to strong memory effects which break down the assumption of time uncorrelation of the external forces acting on the tagged chain.

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