Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 11: POSTER Disperse Polymer Systems

CPP 11.9: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Dynamics of the miscible blend PEO / PMMA — •Katarzyna Niedzwiedz, Andreas Wischnewski, Michael Monkenbusch, Lutz Willner, and Dieter Richter — Institute for Solid State Research, Research Center Juelich, Germany

In spite of intensive studies on binary polymer systems it is still impossible to predict the properties of a blend system on basis of what is known about the behaviour of each component of the mixture. Although it is well known that the dynamics of each component is affected by blending, the dynamic miscibility and in particular the question whether or not there exists a corresponding length scale is still matter of strong controversy. Of particular interest are blends where the dynamics of the pure components is well separated in time, i.e. with a very different glass transition temperature Tg of the pure components. We present a series of neutron spin echo and neutron backscattering data of the miscible polymer blend poly(ethylene oxide) (PEO, Tg = 200 K) / polymethylmethacrylat (PMMA, Tg = 400 K). At temperatures below the Tg of PMMA, the PEO component is still mobile but shows a strong difference in the segmental pair- and self-correlation functions, i.e. in the collective and self motion, respectively. An explanation for these surprising results will be presented.