Fabrication of Microphase-Separated Tröger’s Base Polymer Membranes for Oxygen Enrichment
Chaoyue Yang, Li Zhou, Qian Zhang, Ya Huang, Peixiao Zhang, Jingwen Xue, Qing Li, Weijie Sun, Jiayou Liao
TL;DR
Researchers created a new type of polymer membrane that can efficiently separate oxygen from other gases by using a special structure called microphase separation.
Contribution
The study introduces a novel method to enhance gas separation performance by grafting hydrophobic chains onto Tröger’s base polymers, creating microphase-separated channels.
Findings
Quaternized Tröger’s base membranes showed improved oxygen permeability due to microphase-separated channels.
The QTB-C4-70% membrane exhibited the highest oxygen permeability among tested samples.
Oxygen permeability decreased slightly with pressure but increased with temperature, indicating good pressure stability.
Abstract
Tröger’s base (TB) polymers have received increasing attention as a novel class of polymers with intrinsic microporosity, particularly for applications in gas separation. In this study, TB was quaternized with hydrophobic long chains to create a microphase-separated structure to enhance gas separation performance. On one hand, the tertiary amine structure of TB enabled facile grafting modification through the Menshutkin reaction. On the other hand, microphase-separated channels were created in the quaternized Tröger’s base (QTB) membrane due to the polarity differences between the hydrophilicity of the quaternary ammonium groups and hydrophobicity of iodoalkanes, providing channels for gas transport within the membrane and thereby improving permeability selectivity. The successful synthesis of QTB membranes was confirmed by FTIR and 1H NMR spectroscopy, while AFM and SAXS analyses…
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Taxonomy
TopicsMembrane Separation and Gas Transport · Block Copolymer Self-Assembly · Analytical Chemistry and Chromatography