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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. Papadakis1 — 1TUM 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