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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Polymer and Molecular Dynamics, Friction and Rheology
CPP 40.6: Vortrag
Dienstag, 17. März 2020, 12:15–12:30, ZEU 255
Rheological and diffusion properties of solutions of polyethersulfone and poly(N-vinyl pyrrolidone) for membrane fabrication — •Ulrich A. Handge1, Oliver Gronwald2, Martin Weber2, Joachim Koll1, Clarissa Abetz1, Birgit Hankiewicz3, and Volker Abetz3 — 1Helmholtz-Zentrum Geesthacht, Institute of Polymer Research, Max-Planck-Strasse 1, 21502 Geesthacht, Germany — 2BASF SE, Advanced Materials & Systems Research, Performance Polymer Blends & Membranes RAP/OUB, Carl-Bosch-Strasse 38, 67056 Ludwigshafen, Germany — 3University of Hamburg, Institute of Physical Chemistry, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
Membranes of polyethersulfone (PESU) and poly(N-vinyl pyrrolidone) (PVP) are commonly used for ultrafiltration applications. We investigate the rheological and diffusion properties of solutions which are used for membrane fabrication via a non-solvent induced phase separation process. The polymer solutions are composed of PESU and PVP as well as a mixture of the solvent N-methyl-2-pyrrolidone (NMP) and the non-solvent glycerol. In this work, the influence of glycerol is studied. The addition of glycerol leads to a larger viscosity, a larger average relaxation time and a stronger tendency of demixing. The increase of viscosity is explained by the increase of the monomeric friction coefficient with increasing glycerol concentration. Dynamic light scattering data reveal the existence of two diffusive processes with different time scales in the presence of glycerol. This result is discussed taking into account the phase behaviour of the solution and the solvent quality.