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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: Gels, Polymer Networks and Elastomers III
CPP 42.6: Vortrag
Donnerstag, 21. März 2024, 16:15–16:30, H 0106
Mechanical and rheological properties at the surface of amphiphilic polymer conetworks — •Kevin Hagmann1, Nora Fribiczer2, Sebastian Seiffert2, Carolin Bunk3, Frank Böhme3, and Regine von Klitzing1 — 1Institute for Condensed Matter Physics, Technische Universität Darmstadt, D-64289 Darmstadt — 2Department of Chemistry, Johannes Gutenberg University Mainz, D-55128 Mainz — 3Leibniz-Institut für Polymerforschung Dresden e.V., D-01069 Dresden
The underlying study focuses on the mechanics and rheology at the surface of amphiphilic polymer conetworks (ACNs). Two four-arm star-shaped polymer building blocks made up of tetra-poly(ethylene glycol) and tetra-poly(є-caprolactone) form a 3-dimensional amphiphilic network, that serves as a model system for this study. First, the correlation between different synthesis strategies for gel films and their resulting properties will be described. Secondly, the effect of solvents of different polarity on the swelling ability will be presented on different length scales. For this purpose, topology and near surface structure are studied with atomic force microscopy (AFM). We also put special emphasis on the determination of mechanical and rheological properties laterally and orthogonally to the gel surface by carrying out dynamic AFM indentation experiments. In order to evaluate heterogeneities, the mechanical and rheological behavior at the surface of the ACNs will be presented on various length scales (nm - µm). The study shows that the synthesis strategy has a strong effect on the gel structure and on nano/microrheological properties.
Keywords: Amphiphilic polymer conetworks; atomic force microscopy; length-scale dependent mechanics; nano-rheology; swelling