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Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Nanostructures, Nanostructuring and Nanosized Soft Matter I

CPP 26.3: Vortrag

Mittwoch, 19. März 2025, 12:15–12:30, H34

Star-like molecular brushes with poly(2-oxazoline)-based amphiphilic diblock copolymer side arms — •Wenqi Xu1, Laura Fietzke2, Rustam A. Gumerov3, Feifei Zheng1, Peiran Zhang1, Cy M. Jeffries4, Dmytro Soloviov4, Rainer Jordan2, and Christine M. Papadakis11TUM School of Natural Sciences, Technical University of Munich, Garching, Germany — 2Faculty of Chemistry and Food Chemistry, Technical University of Dresden, Dresden, Germany — 3DWI Leibniz Institute for Interactive Materials, RWTH Aachen University, Aachen, Germany — 4EMBL at DESY, Hamburg, Germany

Poly(2-oxazoline)s (POx) are synthetic, non-toxic, and biocompatible polymers developed to replace the increasingly immunogenic poly(ethylene glycol) in biomedicine. Among many architectural variants of POx, studies on POx-based star brushes are still scarce. In the present work, we investigate molecular brushes, in which diblock copolymers from hydrophilic poly(2-methyl-2-oxazoline) and hydrophobic poly(2-n-butyl-2-oxazoline) are grafted onto star-shaped poly(methyl methacrylate) backbones with the stars having functionalities ranging from 2 to 5. The size and shape of the star brushes were investigated in dilute aqueous solutions using computer simulation, dynamic light scattering, and synchrotron small-angle X-ray scattering. Our results show that these star brushes form ellipsoids with different degrees of elongation. Moreover, a size growth is found for the star brushes at high temperatures, which is attributed to the aggregation of the amphiphilic side arms.

Keywords: polyoxazoline; amphiphilic copolymer; polymer solution; complex architecture

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