Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: POSTER: Colloids and Nanoparticles
CPP 9.8: Poster
Monday, March 26, 2007, 16:00–18:00, Poster B
In-situ investigation of the interfaces of a block copolymer solution under shear stress with µ-focus GISAXS — •Andreas Timmann1, Stephan Volkher Roth1, Steffen Fischer2, and Stephan Förster2 — 1HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg, Germany — 2University of Hamburg, Inst. f. Phys. Chem., Grindelallee 117, D-20145 Hamburg, Germany
Block-copolymers are interesting for their ability to self organize in various structures. In dilute solution they form micelles, cylindrical micelles and vesicles. The length scales of these structures ranges from about 5 nm up to several hundred nanometers. Hence such structures are well suited for investigations using small-angle X-ray scattering (SAXS).
The experiments were performed the beamline BW4 at HASYLAB, Hamburg [1] using the microfocus setup. We present the results of the investigation of an 14.1 wt.% solution of a poly-(isoprene-block-ehtylene oxide) in water. The block degrees of polymerization of the Isopren and the polyethylene oxide were 107 and 343, respectively.[2] The shear stress was applied by a stress-controlled Bohlin CVO rheometer in a plate-plate-geometry with a diameter of 20 mm and a gap of 1 mm. We investigated the interface layers of the solution to air and to the metal plates of the geometry, respectively. We found a dependency of the layer thickness of the metal-solution interface on the application of shear.
References:
[1] Roth et al., Rev. Sci. Instrum., 2006, 77, 085106
A. Timmann, Doctoral Thesis, University of Hamburg, 2005