期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 330, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2021.111636
关键词
Microporous polymers; Networks; Hyper-cross-linked; Polyacetylenes; Schiff base; Covalent templating; Gas sorption
类别
资金
- Czech Science Foundation [21-02183S, CZ.02.2.69/0.0/0.0/19_073/0016935, START/SCI/081]
A new method using a template approach for the formation of permanent micropores in hyper-cross-linked networks is reported. This method could potentially be applied to the preparation of microporous polymers with well-defined texture and surface functionalization.
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 similar to 1 nm) and a specific surface area up to 623 m(2)/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 I-2/g.). The detemplating and micropores formation is confirmed by solid state NMR spectra and N-2 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.
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