Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Nanoparticles and Composite Materials I

CPP 1.1: Hauptvortrag

Montag, 11. März 2013, 09:30–10:00, H34

Rich variety of polymer dynamics in nanocomposites — •Gerald Johannes Schneider — Jülich Centre for Neutron Science, Forschungszentrum Jülich, Outstation at FRM2, Lichtenbergstraße 1, 85747 Garching

Nanocomposites show prominent features in comparison with their respective ingredients. These manifest themselves in a broad range of applications ranging from reinforced rubber to energy related devices. Despite their importance, the respective molecular mechanisms are very complex and remain poorly understood. Particularly this is the case, when attractive interactions of the chains with the surfaces are involved, and e.g. immobilization of chains within an adsorbed layer in the close vicinity of the particles is expected.

In a step toward a better understanding of nanocomposites, the talk illuminates the microscopic polymer dynamics exploiting the high spatial and time resolution of neutron scattering experiments. Using neutron spin echo and time-of-flight spectroscopy, a broad dynamic range – from the segmental relaxation up to the center of mass diffusion of the polymer chains – is explored. This allows for an accurate and detailed picture of the influence of the interaction strength on the chain dynamics and in particular on the molecular motion within the interphase, i.e. in the small layer of adsorbed chains.