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CPP: Chemische Physik und Polymerphysik
CPP 26: POSTER Dynamics and Diffusion
CPP 26.7: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Examination of iterative phenomena during the final stages of the pinching processes of polymeric solutions — •Rainer Sattler1, Christian Wagner1, and Jens Eggers2 — 1Universität des Saarlandes, Experimentalphysik — 2University of Bristol, School of Mathematicsol,
We examine the stretching dynamics of dilute and semidilute solutions of Polyethylene Oxide in both droplet-pinching and capillary-breakup using microscope objectives and high speed video cameras. We investigate the nature and prerequisites for the supposedly iterative formation of beads on the thinning filament, which form as the extension of the polymers saturates. We varied molecular weight, concentration, viscosity of the solvent using different mixtures of glycerol and water and initial diameter, by using different sets of plates and nozzles. Evaluation of the rich behaviour and the present phenomena has yet to prove under which circumstances and for which number of generations the behaviour really shows iterative character and whether or not the size ratios obey deterministic rules. Furthermore the causes for the growth of these instabilities are not yet fully understood and there is not in all cases good agreement between experiments and existing descriptions.