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