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Tröger's Base-Based Microporous Polyimide Membranes for High-Performance Gas Separation.
Zhenggong Wang1,2, 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
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.
