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Updated: Mar 23, 2026

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

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Published on: August 16, 2018

Bifunctionalized Intrinsically Microporous Polyimides with Simultaneously Enhanced Gas Permeability and Selectivity.

Xiaohua Ma¹, Mohsin Mukaddam¹, Ingo Pinnau¹

¹Advanced Membranes and Porous Materials Center (AMPMC), Division of Physical Sciences and Engineering, Chemical and Biological Engineering Program, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Kingdom of Saudi Arabia.

Macromolecular Rapid Communications

|March 31, 2016

Summary

Novel microporous copolyimides show improved CO2 permeability and selectivity after thermal annealing. Further crosslinking enhances CO2 permeability without sacrificing selectivity, offering advanced material solutions.

Keywords:

crosslinking gas separation hydrogen bonding intrinsic microporous polymers polyimides

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Published on: July 14, 2015

Area of Science:

Materials Science
Polymer Chemistry
Chemical Engineering

Background:

Intrinsically microporous polymers (PIMs) are promising for gas separation membranes.
Developing PIMs with enhanced performance, particularly for CO2/CH4 separation, remains a challenge.

Purpose of the Study:

To synthesize and characterize novel intrinsically microporous copolyimides.
To investigate the effect of thermal annealing and crosslinking on the gas transport properties of these copolyimides.

Main Methods:

Condensation polymerization of 6FDA, spirobisindane diol diamine, and diaminobenzoic acid.
Gas permeation measurements (CO2, CH4) before and after thermal treatments.
Porosity analysis using BET method.

Main Results:

Two novel copolyimides (Co-80/20 and Co-50/50) were synthesized.
Co-80/20 exhibited higher microporosity (300 m²/g) than the homopolymer (190 m²/g).
Annealing Co-80/20 at 250°C enhanced CO2 permeability (171 Barrer) and CO2/CH4 selectivity (41).
Crosslinking Co-80/20 at 300°C further increased CO2 permeability (261 Barrer) with maintained selectivity.

Conclusions:

Copolyimide synthesis offers a route to tune PIM properties.
Thermal annealing and crosslinking are effective post-synthesis modification strategies for enhancing gas separation performance.
The developed copolyimides show potential for efficient CO2/CH4 separation applications.