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IRTG / Soft Matter Science
Freiburger Materialforschungszentrum
Stefan-Meier-Str. 21
79104 Freiburg, Germany

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You are here: Home Events Dr. Gerald Schneider "Polymer Dynamics in Model Nanocomposites"

Dr. Gerald Schneider "Polymer Dynamics in Model Nanocomposites"

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Forschungszentrum Jülich, Jülich Centre for Neutron Science (Soft Matter)

  • Seminar
When Nov 06, 2013
from 02:15 PM to 03:00 PM
Where Seminarraum A, FMF, Stefan-Meier-Str. 21, Freiburg
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Polymer based nanostructured materials promise substantially improved features such as increased tensile strength, abrasion resistance, and gas barrier tightness. Even composites with very different material behavior such as an enhanced electrical conductivity or the opposite way around better insulating properties can be assembled. Though intense research in this field has led to substantial progress toward the physical understanding of the interrelation of polymer‐filler affinity, filler structure, and macroscopic properties of filled polymer melts, the chain dynamics of the underlying polymer phase and the interaction mechanisms remain poorly understood.

In order to understand the relationship between macroscopic and nanoscopic properties, the talk illuminates the polymer dynamics at the nanoscale in model nanocomposites. 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. The associated high spatial resolution inherent to scattering experiment provides access to a detailed picture of the influence of the interaction strength on the chain dynamics and in particular on the molecular motion of the polymer close to surfaces. It allows to identify the polymer contribution to the macroscopic properties of nanocomposites. First design rules are shown that may help to develop new functional materials, including different affinities between chains and surfaces, and polymers with increasingly complex architectures.

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