Polymerizable metal-organic frameworks for the preparation of mixed matrix membranes with enhanced interfacial compatibility

The preparation of flawless and defect-free mixed matrix membranes (MMMs) comprising metal-organic framework (MOF) and polymer is often difficult owing to the poorMOF/polymer interface compatibility. Herein, we present the synthesis of an important family of pillared-layered MOFs with polymerizable moieties based on the parent structure [Zn2L2P](n) [L = vinyl containing benzenedicarboxylic acid linkers; P = 4,4'-bipyridine (bipy)]. The crystalline structures of polymerizable MOFs were analyzed using single-crystal X-ray crystallography. The presence of reactive double bonds inMOFs was verified by the successful thiol-ene click reaction with sulfhydryl compounds. The subsequent copolymerization of polymerizable MOFs with organic monomers produced mixed matrix membranes with enhanced MOF/polymer interfacial adhesion that enabled good separation efficiency of CO2 from flue gas. This strategy provides a stimulating platform to the preparation of highly efficient MMMs that are capable of mitigating energy consumption and environment issues.

Automated summary

The study synthesized specific MOFs with reactive double bonds and successfully carried out copolymerization, enhancing the interfacial adhesion between MOFs and polymers. This led to the preparation of mixed matrix membranes capable of efficiently separating CO2, providing a new approach to saving energy and addressing environmental issues.