Is there a higher-order mode coupling transition in polymer blends?

Angel J. Moreno, Juan Colmenero
<span title="2006-05-14">2006</span> <i title="AIP Publishing"> <a target="_blank" rel="noopener" href="" style="color: black;">Journal of Chemical Physics</a> </i> &nbsp;
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
more &raquo; ... relators. 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.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="">doi:10.1063/1.2198202</a> <a target="_blank" rel="external noopener" href="">pmid:16709138</a> <a target="_blank" rel="external noopener" href="">fatcat:tr6szsizo5athgwrmwevoegswq</a> </span>
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