[Back]

M. Iqbal, M. M. Unterlass:
"Design and Synthesis of Polybenzimidazole COFs (PBI-COFs) via Hydrothermal Polymerization";
Poster: 31. Deutsche Zeolith-Tagung, Technische Universität Dresden; 2019-03-06 - 2019-03-08.

Covalent organic frameworks (COFs) are an emerging class of crystalline porous frameworks, which are entirely constructed with organic building units. Ideally, they possess uniform and regular pore size and shape. They are interesting for a wide range of applications such as gas adsorption, catalysis, sensing and energy storage. What still limits the implementation of COFs for the latter applications, is their instability towards chemically demanding environments. The majority of the COFs are based on hydrolytically labile linkages (boraxine, imine etc.). Using stable linkages, such as the imidazole, we aim to push COFs towards realistic implementation.

Hydrothermal polymerization (HTP) is a novel, green alternative synthesis method towards cyclo-condensation products. While the conventional synthetic conditions for such moities require toxic solvents and catalysts, HTP uses only water and precursors. HTP is a geomimetic approach inspired by natural mineral formation within hydrothermal veins.
. Reaction conditions: Monomers are combined in precise ratios in a steel autoclave and water is added. The sealed autoclave is then heated to T >180°C for certain periods of time, under autogenous p.
. Benefits: PBI-COFs obtained in an environmentally friendly way by HTP show outstanding crystallinity, which further enhances thermal and chemical stability.

Website of the event: https://dechema.de/DZT31.html