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000201671 1001_ $$0P:(DE-HGF)0$$aDiddens, D.$$b0$$eCorresponding Author
000201671 245__ $$aMicroscopic understanding of the complex polymer dynamics in a blend —A molecular-dynamics simulation study
000201671 260__ $$aLes Ulis$$bEDP Sciences$$c2011
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000201671 520__ $$aWithin polymer blends composed of two species with largely different glass transition temperatures like PEO/PMMA, the dynamics of the fast PEO component is severely affected by the rather immobile PMMA, reflected by a breakdown of the typical Rouse scaling. The phenomenological random Rouse model (RRM), in which each monomer has an individual mobility obeying a broad log-normal distribution, has been applied to these blends. Using a newly developed method, we extract the distribution of friction coefficients from MD simulations of a PEO/PMMA blend, thereby testing the RRM explicitly. In our simulations we observe that the distribution is much narrower than expected from the RRM. Here, rather, the presence of additional forward-backward correlations of intermolecular origin is responsible for the anomalous PEO behavior.
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000201671 7001_ $$0P:(DE-HGF)0$$aBrodeck, M.$$b1
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