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

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Tröger's Base-Based Microporous Polyimide Membranes for High-Performance Gas Separation.

Zhenggong Wang^1,2, Dong Wang¹, Feng Zhang¹

¹Nano-Bionics Division and i-LAB, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.

ACS Macro Letters

|May 20, 2022

Summary

Tröger

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Area of Science:

Polymer Science
Materials Science
Chemical Engineering

Background:

Polyimides are crucial for gas separation but face challenges in balancing permeability and selectivity.
Enhancing polyimide performance for industrial gas separation remains an active research area.

Purpose of the Study:

To synthesize novel Tröger's Base (TB)-based polyimides.
To improve the gas separation performance of polyimide membranes.

Main Methods:

Polymerization of Tröger's Base diamines with anhydrides to create TB-polyimides.
Fabrication and testing of TB-polyimide membranes for various gas pairs.

Main Results:

TB-polyimide membranes showed significantly enhanced separation performance for H₂/CH₄, H₂/N₂, He/CH₄, and CO₂/CH₄.
6-FDA-based TB-polyimides approached or exceeded the 2008 Robeson upper bound.
High solubility selectivity (up to 62.7) was observed for CO₂/N₂.

Conclusions:

The rigid, in-built amine structure of the TB unit is key to increasing permeability while maintaining selectivity.
TB-based polyimides offer a promising pathway for advanced gas separation applications.
Strong CO₂ affinity with TB's tertiary amine contributes to high CO₂/N₂ selectivity.