Tests of mode coupling theory in a simple model for two-component miscible polymer blends

Abstract

We present molecular dynamics simulations on the structural relaxation of a simple bead-spring model for polymer blends. The introduction of a different monomer size induces a large time scale separation for the dynamics of the two components. Simulation results for a large set of observables probing density correlations, Rouse modes, and orientations of bond and chain end-to-end vectors, are analyzed within the framework of the Mode Coupling Theory (MCT). An unusually large value of the exponent parameter is obtained. This feature suggests the possibility of an underlying higher-order MCT scenario for dynamic arrest.

Revised version. Additional figures and citations

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Cited by in corpus (5)

• Molecular dynamics simulations of glassy polymers
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• Entangled-like Chain Dynamics in Non-entangled Polymer Blends with Large Dynamic Asymmetry
• The Role of Intramolecular Barriers on the Glass Transition of Polymers: Computer Simulations vs. Mode Coupling Theory
• Static and dynamic contributions to anomalous chain dynamics in polymer blends