Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 11: POSTER Disperse Polymer Systems

CPP 11.30: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Flow NMR of dispersed systems — •Ulrich Scheler and Frank Bagusat — Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany

Polymers and dispersions often exhibit non-Newtonian flow behaviour. The detailed investigation of this behaviour requires detailed and localized information, which is efficiently derived from a combination of NMR imaging and pulsed field gradient NMR, providing localized flow information. This is utilized to check the validity of assumption on the flow profile for the data analysis. NMR provides information on the fluid phase as opposed to most other methods. In addition to information on density of the fluid phase (signal intensity), flow direction and velocity contrast in the fluid phase is generated by NMR parameters like relaxation times. This enables the selective investigation of different components in the fluid phase. Experiments are performed in Couette cell in a high-field NMR spectrometer. Variations of the inner cylinder permit the investigation of effects of local high shear. Examples are shown for a silica in water dispersion and oil in water emulsion.