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Updated: Dec 24, 2025
Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
Published on: July 14, 2015
Microporous polyimides with high surface area and CO2 selectivity fabricated from cross-linkable linear polyimides
Ningning Song1, Tengning Ma2, Tianjiao Wang1
1Key Laboratory of High Performance Plastics, Ministry of Education, National & Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer, College of Chemistry, Jilin University, Changchun 130012, PR China.
Researchers created microporous polymers for gas separation by introducing crosslinked structures into linear polyimides. This method enhances carbon dioxide (CO2) uptake and selectivity, offering a new route for high-performance polymer materials.
Area of Science:
- Materials Science
- Polymer Chemistry
- Separation Science
Background:
- Linear polyimides with intrinsic microporosity are key for gas separation due to their porous nature.
- Microporosity in these polymers typically arises from contorted molecular structures.
- Linear polyimides lacking contorted structures generally do not exhibit significant microporosity.
Purpose of the Study:
- To develop a novel method for creating microporous polyimides without relying on inherently contorted structures.
- To investigate the impact of introducing crosslinked structures on polymer porosity and gas separation performance.
- To explore the tunability of microporous structure and CO2 adsorption capacity by modifying polymer substituents.
Main Methods:
- Synthesized linear polyimide precursors via condensation of a cross-linkable dianhydride with novel nitrogen-rich diamines.
- Introduced microporosity through post-polymerization crosslinking reactions.
- Characterized the resulting crosslinked polyimides (PI-CLs) for their porous structure and gas adsorption properties.
- Evaluated CO2/N2 and CO2/CH4 selectivity of the PI-CLs, particularly those with trifluoromethyl groups (CF3-PI-CL).
Main Results:
- Crosslinked polyimides (PI-CLs) were successfully constructed, exhibiting tunable microporous structures.
- PI-CLs demonstrated competitive CO2 uptake capacities ranging from 7.3-9.4 wt% at 273 K and 1 bar.
- The CF3-PI-CL exhibited exceptional CO2/N2 (72) and CO2/CH4 (22) selectivity at 273 K, outperforming many existing porous materials.
- The study confirmed that crosslinking and substituent modification are effective strategies for creating microporous polyimides.
Conclusions:
- Introducing crosslinked structures into linear polyimides is an efficient strategy to create abundant micropores and enhance gas separation capabilities.
- The developed method provides a versatile approach for fabricating high-performance microporous polymers, even from linear polymers lacking inherent contorted structures.
- The findings highlight the potential of tailored crosslinking for designing advanced materials for carbon capture and other separation applications.
