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Tuning the Gas Selectivity of Tröger's Base Polyimide Membranes by Using Carboxylic Acid and Tertiary Base Interactions
Author(s) -
Wang Zhenggong,
Isfahani Ali Pournaghshband,
Wakimoto Kazuki,
Shrestha Binod Babu,
Yamaguchi Daisuke,
Ghalei Behnam,
Sivaniah Easan
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801002
Subject(s) - polyimide , gas separation , membrane , carboxylic acid , monomer , selectivity , permeation , polymer chemistry , base (topology) , chemical engineering , chemistry , materials science , polymer , organic chemistry , catalysis , mathematical analysis , biochemistry , mathematics , layer (electronics) , engineering
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.