TY  - JOUR
AU  - Diddens, D.
AU  - Brodeck, M.
AU  - Heuer, A.
TI  - Microscopic understanding of the complex polymer dynamics in a blend —A molecular-dynamics simulation study
JO  - epl
VL  - 95
IS  - 5
SN  - 1286-4854
CY  - Les Ulis
PB  - EDP Sciences
M1  - FZJ-2015-03965
SP  - 56003 -
PY  - 2011
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000294325500023
DO  - DOI:10.1209/0295-5075/95/56003
UR  - https://juser.fz-juelich.de/record/201671
ER  -