Tuning the Gas Selectivity of Tröger's Base Polyimide Membranes by Using Carboxylic Acid and Tertiary Base Interactions. Issue 16 (10th July 2018)

• Record Type: Journal Article
• Authors: Wang, Zhenggong; Isfahani, Ali Pournaghshband; Wakimoto, Kazuki; Shrestha, Binod Babu; Yamaguchi, Daisuke; Ghalei, Behnam; Sivaniah, Easan
• Is Part Of: ChemSusChem. Volume 11:Issue 16(2018)
• Page Start: 2744
• Page End: 2751
• Publication Date: 2018-07-10
• Subjects: carboxylic acids -- gas separation -- membranes -- plasticization -- polyimide; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201801002
• Languages: English
• ISSNs: 1864-5631

Abstract

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. Abstract : Separating gases : New Tröger's base‐based copolyimides containing carboxylic acid groups are designed and prepared to investigate the acid–base interaction effect on gas separation performance. The gas permeation data reveal that the copolyimides show tunable separation performance and excellent gas selectivity by increasing the carboxylic acid group content.