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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster Session III - Charged Soft Matter and Theory and Simulation
CPP 22.39: Poster
Mittwoch, 24. März 2021, 16:30–18:30, CPPp
Self-Assembly of Copolymers in Presence of Solvent Evaporation — •Gregor Ibbeken and Marcus Müller — Institut für Theoretische Physik, Georg August Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Deutschland
Integral asymmetric block copolymer membranes constitute a fascinating new technology for ultrafiltration. Solvent evaporation aligns and facilitates the long-range order of microphase separating diblock copolymers, which is exploited to form monodisperse pores. More specifically, we are interested in the emergence of perpendicularly oriented, cylindric morphologies. We investigate a system consisting of a diblock copolymer, a solvent and air by use of a continuum model in which the concentrations act as order parameters. This allows us to explore the high-dimensional parameter space with a parameter study. Four parameters turn out to have a dominant influence on emergent morphologies, namely the polymer volume fraction, the surface preference, the incompatibility of polymer blocks and the evaporation rate. Kinetically, the orientation of cylinders is determined immediately after the onset of microphase separation. If cylinders become stable when the evolution zone is wide enough, initially developed spheres elongate vertically. Most notably, this occurs for high evaporation rates. Additionally, we are able to demonstrate that the kinetic pathways taken are describable as paths in a two-dimensional parameter space consisting of effective block ratio feff and effective segregation strength χ Nabeff.