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Tuning the Gas Selectivity of Tröger's Base Polyimide Membranes by Using Carboxylic Acid and Tertiary Base Interactions

Tuning the Gas Selectivity of Tröger's Base Polyimide Membranes by Using Carboxylic Acid and Tertiary Base Interactions

Zhenggong Wang, Ali Pournaghshband Isfahani, Kazuki Wakimoto, Binod Babu Shrestha, Daisuke Yamaguchi, Behnam Ghalei, Easan Sivaniah

ChemSusChem. 2018 Aug 22;11(16):2744-2751.

PMID: 29808569

Abstract:

Polyimide-based materials provide attractive chemistries for the development of gas-separation membranes. Modification of inter- and intra-chain interactions is a route to improve the separation performance. In this work, copolyimides with Tröger's base (TB) monomers are designed and synthesized. In particular, a series of copolyimides is synthesized with different contents of carboxylic acid groups (0-50 wt %) to alter the inter- and intra-chain interactions and enhance the basicity of the TB-polyimides. A detailed thermal and structural analysis is provided for the new copolyimides. Gas permeation data reveal a tunable trend in separation performance with increasing carboxylic acid group content. Importantly, this is one of the few examples of copolyimide membranes materials that show enhanced plasticization resistance to high-pressure gas feeds through physical cross-linking.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP21451741	(+)-Tröger's base		21451-74-1	Price

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