Abstract
We present molecular dynamics simulations of the structural relaxation of a simplebead–spring model for polymer blends. The introduction of a different monomer sizeinduces a large timescale separation for the dynamics of the two components. Simulationresults for a large set of observables probing density correlations, Rouse modes, andorientations of bond and chain end-to-end vectors are analysed within the framework of themode coupling theory (MCT). An unusually large value of the exponent parameter isobtained. This feature suggests the possibility of an underlying higher-order MCT scenariofor dynamic arrest.
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