AIMs: a new strategy to control physical aging and gas transport in mixed-matrix membranes

Melanie Kitchin, Jesse Teo, Kristina Konstas, Cher Hon Lau, Christopher J. Sumby, Aaron W. Thornton, Christian J. Doonan, Matthew R. Hill

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47 Citations (Scopus)

Abstract

The effect of controlling interactions between the components in a mixed-matrix membrane at the molecular level has been explored. A systematic series of soluble metal-organic polyhedra (MOPs) of varying external organic chain length were prepared and applied within polymer membranes to produce anti-aging intercalated membranes (AIMs). Use of a soluble porous additive allowed for intimate mixing between the polymer and the porous additive, eliminating the formation of non-selective gas transport voids at the interface, typically found in traditional mixed-matrix membranes. Moreover, the molecular interaction thus created provided a valuable tool for tailoring the physical aging rates of the membranes. Aging was slowed by a factor of three with the optimal tBu-MOP additive, and viscosity measurements revealed they held the strongest MOP-polymer interaction, confirming the utility of the AIMs approach. MOP loading was therefore able to be optimized for the maximum anti-aging effect by monitoring the relative change in viscosity. Absolute gas permeability scaled with the MOP external organic chain length, revealing solubility-driven diffusion.
Original languageEnglish
Pages (from-to)15241-15247
Number of pages7
JournalJournal of Materials Chemistry A
Volume3
Issue number29
DOIs
Publication statusPublished - 7 Aug 2015
Externally publishedYes

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