%0 Journal Article
%A Diddens, D.
%A Brodeck, M.
%A Heuer, A.
%T Microscopic understanding of the complex polymer dynamics in a blend —A molecular-dynamics simulation study
%J epl
%V 95
%N 5
%@ 1286-4854
%C Les Ulis
%I EDP Sciences
%M FZJ-2015-03965
%P 56003 -
%D 2011
%X Within 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000294325500023
%R 10.1209/0295-5075/95/56003
%U https://juser.fz-juelich.de/record/201671