Rheology/Morphology

Part of our research in this area is dealing with homogeneous mixtures and part with the rheology of systems consisting of two liquid phases. For one phase mixtures a new concept has proven to be very helpful to model the viscosity h. It starts from the idea that energy dissipation is taking place on the surface of the molecules and not in their interior. Consequently the usual composition variables are for the theoretical treatment substituted by surface fractions. This approach proved advantageous for the description and prediction of viscosities means of a small number of physically meaningful parameters. Another phenomenon we are studying is the influence of electrical fields on homogeneous systems to avoid harmful aging effects. Finally, like with our thermodynamic studies we are including the effects of hydrostatic pressure on the viscosity of polymer solutions on intrinsic viscosities and on characteristic relaxation times (entanglement times) into our research program. Rheology The central questions of our work with flowing two-phase mixtures are the rheological steady state behavior and the corresponding morphologies, plus the routes along which such time-independent states are reached. The most recent observation in this area consists of periodical viscosity oscillations and uncommon morphologies that were so far not reported in the literature.

 

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