Is there a higher-order Mode Coupling transition in polymer blends?

Details Is there a higher-order Mode Coupling transition in polymer blends? Is there a higher-order Mode Coupling transition in polymer blends?

2005-11-08

arxiv.org/abs/cond-mat/0511181v3

Journal of Chemical Physics 124 (2006) 184906

Physics

Condensed Matter

Soft Condensed Matter

Published in Journal of Chemical Physics 124 (2006) 184906

Scientific paper

10.1063/1.2198202

We present simulations on a binary blend of bead-spring polymer chains. The introduction of monomer size disparity yields very different relaxation times for each component of the blend. Competition between two different arrest mechanisms, namely bulk-like dynamics and confinement, leads to an anomalous relaxation scenario for the fast component, characterized by sublinear time dependence for mean squared displacements, or logarithmic decay and convex-to-concave crossover for density-density correlators. These anomalous dynamic features, which are observed over time intervals extending up to four decades, strongly resemble predictions of Mode Coupling Theory for nearby higher-order transitions. Chain connectivity extends anomalous relaxation over a wide range of blend compositions.

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