Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.7: Poster
Montag, 26. März 2012, 17:30–20:00, Poster A
Microscopic Characterization of Nanocomposites Featuring Attractive Polymer-Particle Interactions — •Thomas Glomann1, Gerald Schneider2, Wim Pyckhout-Hintzen1, Jürgen Allgaier1, and Dieter Richter1 — 1Jülich Centre for Neutron Science (JCNS-1) & Institute for Complex Systems (ICS-1), Forschungszentrum Jülich GmbH, D-52425 Jülich — 2Forschungszentrum Jülich GmbH, JCNS am FRM II, Lichtenbergstr. 1, 85747 Garching
Attractive surface interactions between the particle and the polymer phase result in a layer of adsorbed chains on the particle surface which greatly influences e.g. the viscoelastic properties of the nanocomposite.
Poly(alkylene oxide)s (PAO)s mixed with bare silica nanoparticles are ideal model systems to gain microscopic insights on the role of surface interactions in nanocomposites. Strong attractive interactions are present between the OH-groups on the silica surface and the oxygen in the polymer backbone due to hydrogen bonding. Different sets of low and high molecular weight samples were prepared by solution blending of silica nanoparticles with appropriate mixtures of protonated and deuterated chains.
We present first results of our investigations of the microscopic chain structure and chain dynamics in the presence of adsorbing surfaces by means of using small-angle neutron scattering and neutron spin-echo spectroscopy.