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TT: Fachverband Tiefe Temperaturen

TT 91: 2D Materials VII: Heterostructures (joint session O/TT)

TT 91.9: Talk

Friday, March 22, 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