Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 105: 2D Materials VII: Heterostructures (joint session O/TT)
O 105.9: Vortrag
Freitag, 22. März 2024, 12:30–12:45, MA 005
Mechanical Characterization of Molecular Sieving Polymers — •Jakob Kreie1, André Beyer1, Yonghang Yang2, Zhikun Zheng2, and Armin Gölzhäuser1 — 1Physics of Supramolecular Systems and Surfaces, Bielefeld University, Germany — 2School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong, Republic of China
To enable the practical use of molecular sieves on a larger scale, it is crucial to achieve a certain mechanical stability and elasticity. Our study deals with the analysis of polymer membranes as molecular sieves, these 2D imine-linked covalent organic frameworks are periodic and porous networks. The focus of the research is on their permeability as well as their mechanical properties.
Through the application of an atomic force microscope, we conducted comprehensive evaluations using free-standing nanoindentation and the bulge test. The results revealed a Young's modulus of 55 GPa and a breaking strength of 83 N/m for a membrane thickness of 45 nm. Moreover, our observations demonstrated remarkable elasticity during repeated tests, even after localized damage to the free-standing membrane had occurred.
Keywords: Atomic Force Microscope; Covalent Organic Frameworks; Polymers