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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Modeling and Simulation of Soft Matter II

CPP 21.3: Vortrag

Dienstag, 18. März 2025, 14:30–14:45, H34

Tuning Pore Size in Integral-Asymmetric, Isoporous Membranes via Bidisperse Diblock Copolymers — •Jiayu Xie and Marcus Müller — Institute for Theoretical Physics, Georg August University Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Integral-asymmetric isoporous membranes, widely used in water filtration, are fabricated using a combination of evaporation-induced self-assembly (EISA) and nonsolvent-induced phase separation (NIPS). Membranes must have pores of an optimal size; small enough to block target substances but not so small as to cause excessive water resistance. While pore size can technically be adjusted by varying the copolymer's degree of polymerization, this approach requires synthesizing new copolymers for each desired pore size. A more economical alternative is blending polymers, where tuning the blending ratio of different components offers a feasible way to control pore size. However, mixing different copolymers could lead to macrophase separation. In this study, we focus on bidisperse diblock copolymers, and employ self-consistent field theory and particle-based simulations to explore the range of pore sizes over which this blending strategy is effective in fabricating membranes. Specifically, we aim to (1) establish correlations between system parameters and pore size and (2) elucidate the effects of these parameters on the dynamic behavior during SNIPS and the resulting membrane morphologies. Our findings provide valuable insights for the cost-effective fabrication of filtration membranes with tailored pore sizes.

Keywords: Porous Membrane; SNIPS; Particle Simulation