Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.6: Poster
Montag, 26. März 2012, 17:30–20:00, Poster A
Interfacial Properties of Grafted Nanoparticle Based Nanocomposites — •Mathias Meyer1,2, Eike Hübner3, Wim Pyckhout-Hintzen1,2, Jürgen Allgaier1,2, and Dieter Richter1,2 — 1Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Jülich, Germany — 2Institute for Complex Systems, Forschungszentrum Jülich GmbH, Jülich, Germany — 3Institut für Organische Chemie, Technische Universität Clausthal, Clausthal, Germany
Though nanocomposites with their astonishing properties are of great interest for research and industry, microscopic details of the polymer-interface have been scarcely investigated. Therefore a model system basing on grafted silica nanoparticles is designed and studied. From TEM, SANS and SAXS experiments, particle sizes and their distribution were determined independently. They also reveal a core-shell-like structure of the non-grafted particles which has been neglected in literature so far. The influence of the grafting density and the chain length and type of the graft as well as of the dispersing medium were investigated in terms of a polydisperse core-shell-type model. Our experimental results are compared to multiscale simulations within an EU FP7 project (NanoModel), focussing on the radial density profile of the polymer shell. Due to our newly developed 'grafting to' approach a labelling of the grafted chains is now possible, which allows for the first time to investigate the chain conformation in the shell.