Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Nanoparticles and Composite Materials
CPP 12.27: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Microscopic Investigation of Polymer Chain Dynamics in Nanocomposites with Strong Attractive Interaction — •Thomas Glomann1, Gerald J. Schneider2, Jürgen Allgaier2, and Dieter Richter2 — 1Jüllich Centre for Neutron Science & Institute for Complex Systems, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Centre for Neutron Science, Forschungszentrum Jülich, Outstation at FRM 2, Lichtenbergstraße 1, 85747 Garching, Germany
The mechanical properties of polymer based nanocomposites are essentially determined by surface interactions between the chains and filler particles. In particular the strong hydrogen bonding interaction energy causes dynamic adsorption of chain segments on hydrophilic surfaces which is often reported to yield an immobilized layer of mostly suppressed or “glassy” dynamics.
Using high-resolution quasi-elastic neutron scattering techniques we found experimental evidence for highly flexible chain dynamics within the adsorbed layers on both the large and local length scale. We present results of neutron spin-echo and time-of-flight measurements on PEO-Silica model systems where the interaction energy was tuned using differently terminated polymers.