MOF (metal-organic framework) and polyurethane crosslinked membrane as well as preparation method and application thereof

Abstract

The invention discloses a MOF (metal-organic framework) and polyurethane crosslinked membrane as well as a preparation method and an application thereof. Post-synthesis modification is performed on active amino or hydroxyl on MOFs through a polyurethane prepolymer, nanocrystals of the MOFs are linked under the covalent bond function of active amino or hydroxyl and polyurethane prepolymer, so that the compatibility and the acting force between the MOFs particles and a polymer chain are improved, modified MOFs derivatives are endowed with excellent flexibility and a film-forming property, and a new method for preparing MOFs membrane devices is established. The synthesized MOFs membrane material has good selective separation effect on dye molecules in water and has great application prospects in the membrane separation field.

Description

technical field [0001] The invention relates to a metal organic framework-polyurethane crosslinked membrane, a preparation method and application thereof, and belongs to the technical field of polymer separation membranes. Background technique [0002] Metal-organic frameworks (MOFs) are porous polymeric materials composed of metal ions or clusters covalently linked by organic ligands. Rich in functionality and simple preparation, these unique advantages make it a research hotspot in recent years. The specific open pores and active sites in MOFs make them selectively permeable to certain molecules, showing great potential in the field of separation. [0003] MOFs are similar to inorganic crystal materials, and their physical state is mostly crystal powder or particles. When the structure is not destroyed, the brittle framework presents the characteristics of insolubility. Therefore, although MOFs have many incomparable advantages, pure MOFs materials are very Difficult to ...

AI Technical Summary

Problems solved by technology

[0004] In recent years, in order to realize the deviceization of MOFs, researches on MOF membrane materials have been reported one after another. MOF-related membrane materials include: supported MOFs thin films and composite matrix MOFs thin films. properties, but there are still defects in varying degrees. Most of the supported MOFs membranes are difficult to peel off from the substrate to form independent membranes, and their strength is low; in order to obtain satisfactory performance, the poor compatibility and Particle agglomeration problem must be solved

Therefore, although good achievements and developments have been made in MOFs-related membrane materials in recent years, most of them still lack homogeneity at the molecular level.

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