A method for preparing cross-linked polymer-MOF composites that demonstrate nearly full preservation of MOF porosity as well as improvements in bulk mechanical strength and stability.
Metal organic framework (MOF) hybrid materials such as polymer-MOF composites have attracted attention as a result of their potential to be used across a diverse set of applications, which include but are not limited to water purification, nanofiltration, gas storage, gas separation, sensing, drug delivery and energy harvesting. However, limitations and incompatibilities of their parent compounds have presented challenges to their development. For example, poor solubility of MOFs prevents their uniform dispersion in a polymer matrix, leading to aggregation which is not only detrimental to transport paths, but also limits the structural integrity of the polymer, while polymer chains tend to block or penetrate the MOF’s porous structures, thereby further compromising functionality.
This invention provides versatile methods of covalent hybridization through post-synthetic ligand exchange to form a crosslinked polymer-MOF composite that fully preserves MOF surface area and porosity given that ligand exchange is limited to surface sites. This method has been used to prepare PAA-MOF composites with MOF loadings up to 80%. Further, these materials have demonstrated hydrolytic stability for at least 20 days; thus, overcoming a limitation seen with many of the most commonly researched MOFs.
Publication Link: Chem. Mater. 2018, 30, 23, 8639-8649
This method enables the synthesis of cross-linked polymer-MOF networks that possess improvements in strength, flexibility, and stability, while retaining the porosity of the pure framework.
- Purification and filtration
- Gas storage and separation
- Drug delivery
- Energy harvesting
Intellectual Property Summary:
US Provisional Patent Application 62/889,203 filed August 20, 2019.
Stage of Development: Prototype demonstration.
Licensing Status: Available for licensing or collaboration.