Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Nanoparticles and Composite Materials
CPP 12.1: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Experimental Observation of the wetting property of homopolymer on a grafted polymer on a curved substrate — •Chang Jong Kim1, Markus Mazurowski2, Jun Yu Li1, Markus Gallei2, Katrin Sondergeld2, Henrich Frielinghaus3, Matthias Rehahn2, and Bernd Stühn1 — 1Experimental Condensed Matter Physics, TU Darmstadt — 2Ernst-Berl-Institute for Technical and Macromolecular Chemistry, TU Darmstadt — 3Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH
The wetting property of homopolymer on a grafted polymer on a nanoparticle surface is greatly influenced by the ratio of the molar mass of the polymer on the surface (N) and the matrix polymer (P). Grafting density and the ratio of the length of grafted polymer (Rg) to the radius of a core (Rc) may play an important role in the wetting property as well. The change of the wetting property, the wetting-dewetting transition, is therefore expected to be induced by a combination of three parameters: P/N, Rg/Rc ratio and grafting density. In our experiment, Polystyrene (PS) was grafted from the surface of nanoparticles (silica and deuterated PS). These particles were then dispersed in deuterated PS matrices and measured by Small Angle X-ray Scattering (SAXS) and Small Angle Neutron Scattering (SANS). P/N ratio was varied from <1 to ≫1 and Rg/Rc ratio was tuned by using two different molar masses of the grafted chain onto which the same core was used. In particular the analysis of the SANS results allows to determine thickness and conformation of the polymer brush on the curved substrate.