Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Focused Session: Confinement of Polymers in Nanoscopic Layers - How Much do Properties Change? II
CPP 16.4: Vortrag
Dienstag, 15. März 2011, 15:15–15:30, ZEU 160
Density in polymer films and at the polymer-solid interface — •Eicke Tilo Hoppe1, Boyuan Wang1, Martin Haese-Seiller2, Jean-Francois Moulin2, Max Port3, Bernhard Menges3, and Christine M. Papadakis1 — 1TU München, Physik-Department, Fachgebiet der weichen Materie, Garching, Germany — 2GKSS-Forschungszentrum Geesthacht, Geesthacht, Germany — 3MPI for Polymer Research, Material Science Group, Mainz, Germany
The change in physical behaviour of polymers at interfaces is of importance for the adhesion of polymer coatings to solids, e.g. in medical implants and in nanocomposites. The aim of the project is the investigation of the influence of the polymer-solid interaction on the physical properties of the polymers near the interface.
We focus on the correlation between the changes of density, viscosity and chain orientation of the polymer melt near the interface. Polybutadiene melts from toluene solutions on silicon oxide are studied as a model system. To tune the interface interactions between substrate and polymer melt, the substrate surface is modified chemically and by silanization. The density profile near the solid interface is investigated by time-of-flight neutron reflectometry (TOF-NR) at REFSANS. The films have a lower density than the bulk value expected from literature and density deviations at the interface. The optical properties of polybutadiene are investigated in the bulk using optical waveguide spectroscopy, whereas the interphase is characterized by monitoring the surface plasmon. The refractive index in the interphase close to the gold-coated glass is lower compared to the bulk.