Microporous polymers prepared from non-porous hyper-cross-linked networks by removing covalently attached template molecules

0550078 - ÚMCH 2023 RIV NL eng J - Článek v odborném periodiku
Bashta, B. - Havelková, L. - Sokol, J. - Brus, Jiří - Sedláček, J.
Microporous polymers prepared from non-porous hyper-cross-linked networks by removing covalently attached template molecules.
Microporous and Mesoporous Materials. Roč. 330, January (2022), č. článku 111636. ISSN 1387-1811. E-ISSN 1873-3093
Institucionální podpora: RVO:61389013
Klíčová slova: microporous polymers * networks * hyper-cross-linked
Obor OECD: Polymer science
Impakt faktor: 5.2, rok: 2022
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S1387181121007629?via%3Dihub

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.
Trvalý link: http://hdl.handle.net/11104/0325934