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Updated: Jan 15, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

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Solution-Processable, Ladder-Branched Polyimides of Intrinsic Microporosity by [4+4] Cycloaddition for Membrane Gas

Tae Hoon Lee^1,2, Pablo A Dean¹, Jing Ying Yeo¹

¹Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, United States.

Advanced Materials (Deerfield Beach, Fla.)

|October 15, 2025

Summary

UV light modifies microporous polymer membranes, significantly boosting CO2 permeability and selectivity for cleaner energy and environmental applications. This advanced material overcomes previous limitations in membrane performance and durability.

Keywords:

anthracene gas separation membranes microporous polymers post‐synthetic modification

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Area of Science:

Materials Science
Polymer Chemistry
Chemical Engineering

Background:

Membrane-based gas separation is crucial for energy and environmental solutions.
Developing advanced membrane materials with high performance, stability, and processability remains a significant challenge.

Purpose of the Study:

To develop a novel post-synthetic modification strategy for polyimides of intrinsic microporosity (PIM-PIs).
To enhance membrane separation performance, stability, and processability for gas separation applications.

Main Methods:

Synthesized PIM-PIs with a UV-reactive anthracene co-monomer.
Applied UV irradiation to induce [4+4] cycloaddition, forming dianthracene linkages.
Characterized the structural and gas transport properties of the modified membranes.

Main Results:

UV treatment significantly increased microporosity and ultramicroporosity.
Achieved a 260% increase in CO2 permeability (376 barrer) with CO2/CH4 selectivity of 35.
Demonstrated enhanced stability against aging and plasticization, surpassing the 2018 mixed-gas upper bound.

Conclusions:

Post-synthetic UV modification of PIM-PIs offers a viable route to high-performance membranes.
The developed membranes show exceptional CO2/CH4 separation capabilities under various conditions.
This approach provides a promising solution for challenging gas separation processes.