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Microporous polymers prepared from non-porous hyper-cross-linked networks by removing covalently attached template molecules
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SYSNO ASEP 0550078 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Microporous polymers prepared from non-porous hyper-cross-linked networks by removing covalently attached template molecules Author(s) Bashta, B. (CZ)
Havelková, L. (CZ)
Sokol, J. (CZ)
Brus, Jiří (UMCH-V) RID, ORCID
Sedláček, J. (CZ)Article number 111636 Source Title Microporous and Mesoporous Materials. - : Elsevier - ISSN 1387-1811
Roč. 330, January (2022)Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords microporous polymers ; networks ; hyper-cross-linked Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000761815600002 EID SCOPUS 85121246699 DOI 10.1016/j.micromeso.2021.111636 Annotation A new method for the formation of permanent micropores in hyper-cross-linked networks is reported. This method is based on a template approach, using small molecules (4-methylaniline and 4-methylbenzaldehyde) as templates. These molecules are covalently attached via azomethine links to parent non-porous hyper-cross-linked polyacetylene networks prepared by chain-growth homo and copolymerization of ethynylated monomers. Highly efficient and well-defined postpolymerization hydrolysis of the networks leads to (i) cleavage of azomethine links and (ii) removal of the template molecules from the networks. Although up to 40 wt % of the mass of the networks are removed via hydrolysis, the hyper-cross-linked scaffold of the networks is not collapsed and micropores are formed in the networks. In this way, the parent non-porous networks are transformed into networks with permanent micropores (diameter ∼1 nm) and a specific surface area up to 623 m2/g−1. Simultaneously with the formation of micropores, functional groups (NH2, CHO) are introduced into the networks. The prepared microporous networks adsorb the model adsorptives (up to 1.73 mmol CO2/g and up to 6.53 mmol I2/g.). The detemplating and micropores formation is confirmed by solid state NMR spectra and N2 adsorption/desorption isotherms. The reported method of micropores formation could find a wider application for the preparation of microporous polymers with a well-defined texture and surface functionalization. Not only azomethine links but also many other groups with cleavable bonds could potentially be used for templating with covalently attached small molecules. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S1387181121007629?via%3Dihub
Number of the records: 1