2005/11/30 by Angel J. Moreno, Juan Colmenero · 1 citation
Chemical Engineering · Chemistry · Materials Science · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Material Dynamics and Properties #Rheology and Fluid Dynamics Studies #cond-mat.soft
paper · pdf · doi:10.1063/1.2198202
published as Journal of Chemical Physics 124 (2006) 184906 · Published in Journal of Chemical Physics 124 (2006) 184906
arxiv created 2006/05/11 · openalex publication_date 2006/05/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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, bulklike 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 4 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.