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Preparation of Freestanding Conjugated Microporous Polymer Nanomembranes for Gas Separation

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Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
§ Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
Institute for Organic Chemistry (IOC), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
# Institute of Toxicology and Genetics (ITG), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
* M. Tsotsalas. E-mail: [email protected]
Cite this: Chem. Mater. 2014, 26, 24, 7189–7193
Publication Date (Web):November 20, 2014
https://doi.org/10.1021/cm503924h
Copyright © 2014 American Chemical Society

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    Conjugated microporous polymers (CMPs) have attracted much interest due to their intrinsic porosity, outstanding stability, and high variability. However, the processing of these materials for membrane application has been limited due to their insoluble nature when synthesized as bulk material. Here we report the synthesis of freestanding CMP-nanomembranes via layer-by-layer growth of a “click” based conjugated microporous polymer on a sacrificial substrate. After dissolution of the substrate the CMP-nanomembrane can be transferred to porous substrates and continuously cover holes of up to 50 μm diameter. The CMP-nanomembranes appear defect-free as inferred from high selectivity values obtained from gas permeation experiments and from electrochemical investigation in the presence of ferrocene. The presented synthesis method represents a versatile strategy to incorporate CMP materials in functional devices for membrane separation, catalysis, or organic electronics.

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