SKM 2021 – wissenschaftliches Programm
CPP 4.4: Vortrag
Dienstag, 28. September 2021, 11:30–11:45, H3
Microscopic and macroscopic mechanical properties of amphiphilic model co-networks — •Nora Fribiczer1, Kevin Hagmann2, Carolin Bunk3, Sebastian Seiffert1, Regine von Klitzing2, and Frank Böhme3 — 1Department of Chemistry, Johannes Gutenberg University Mainz, D-55128 Mainz — 2Institute for condensed matter physics, Technische Universität Darmstadt, D-64289 Darmstadt — 3Leibniz-Institut für Polymerforschung Dresden e.V., D-01069 Dresden
Amphiphilic polymer gels are composed of both hydrophilic and hydrophobic polymers, which makes their mechanical properties dependent on environmental conditions such as the solvent polarity. In this work, we present both a microscopic and macroscopic perspective of these properties using indentation atomic force microscopy and oscillatory shear rheology. With this, we aim to get a rational understanding of the interplay between the environmental conditions and the resulting mechanical properties in the bulk material and at the interface.
Next to the investigation of the mechanical properties under good and bad solvent conditions, we put special emphasis on the characterization of the gelation process during network formation. By variation of concentration and temperature the reactivity and network topology can be controlled due to the use of an innovative bi-functional coupling agent which connects the hydrophilic tetra-PEG and the hydrophobic tetra-PCL. Monitoring the network formation using shear rheology allows for determination of the respective gel points, which coincide with results obtained from nuclear magnetic resonance spectroscopy.