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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Focus: Soft Matter and Nanocomposites - New opportunities with advanced neutron sources II

CPP 19.2: Vortrag

Montag, 16. März 2020, 15:15–15:30, ZEU 222

On the structure and inner dynamics of zwitterionic polysulfobetaine brushes — •Judith Witte¹, Olaf Holderer², Jörg Lahann^3,4, and Stefan Wellert¹ — ¹Technische Universität Berlin, Berlin, Germany — ²Heinz Maier-Leibnitz Zentrum, Garching, Germany — ³University of Michigan, Ann Arbor, MI, USA — ⁴Karlsruhe Institute of Technology, Karlsruhe, Germany

PMEDSAH brushes are zwitterionic polysulfobetaine brushes, which are investigated as a microenvironment for the attachment and lift-off of cells and proteins. Structure and dynamics of polymer brushes influence the motion of macromolecules, nanoparticles or proteins at and along the interface and their potential adsorption at or penetration into the brushes. So far, a rather simple approach is used to discuss the complex self-association behavior. Still, a more detailed understanding of the structure and dynamics within PMEDSAH brushes, especially of the self-association behavior, is lacking. We conduct a series of complementary laboratory and neutron scattering experiments to improve the basic understanding of the influence of the grafting density on the brush structure and inner dynamics. Beside X-ray-reflectometry and ellipsometry measurements on dry polysulfobetaine brushes with different grafting densities also multi contrast neutron reflectometry measurements on the wet brushes were performed to investigate the brush structure in dependence on the grafting density. Additionally, neutron spin echo spectroscopy under grazing incidence is applied to study the influence of the self-association on the segmental dynamics in the polysulfobetaine brushes.