Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.18: Poster
Monday, March 26, 2012, 17:30–20:00, Poster A
Separating interface from melt dynamics in a model system — •Christian Mark1, Martin Brodeck1, Wim Pyckhout-Hintzen1, Jürgen Allgaier1, Eike Hübner2, and Dieter Richter1 — 1JCNS-1 & ICS-1, Forschungszentrum Jülich GmbH, Jülich, Germany — 2Institut für Organische Chemie, TU Clausthal, Clausthal, Germany
Designing polymer-based materials with improved properties is an increasingly important field of polymer science. One particular area of interest within that field are the so-called polymer nanocomposites, which are made up of polymer and nanosized filler particles. It is our intent to connect the macroscopic properties of these composite materials to microscopic structure and dynamics.
The dynamics of these systems are, however, a quite difficult topic to study in microscopic detail. This is due to the generally large polydispersity of the nano-components as well as the fact that the measured dynamics are usually a mixture of both interface and melt dynamics. We were able to create grafted nano-sized silica particles (r = 7nm) with a large grafting density (0.7 per square nm, 5K PI), which should provide a sufficient "screen" for separating interface dynamics from melt dynamics. In addition, the grafted particles also allow us to study the dynamics of the grafted polymer chains themselves.
The method used to study the microscopic dynamics is inelastic neutron scattering (Neutron Backscattering and Neutron Spin Echo).