Tailoring the Microporosity of Polymers of Intrinsic Microporosity for Advanced Gas Separation by Atomic Layer Deposition

Tailoring the microporosity of intrinsically microporous polymers at the atomic level is one of the biggest challenges in achieving high‐performance polymeric gas separation membranes. In this study, for the first time, the Al2O3 atomic layer deposition (ALD) technique was used to modify the micropo...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-08, Vol.60 (33), p.17875-17880
Main Authors: Chen, Xiuling, Wu, Lei, Yang, Huimin, Qin, Yong, Ma, Xiaohua, Li, Nanwen
Format: Article
Language:English
Subjects:
Aging
Al2O3
Aluminum oxide
atomic layer deposition
Atomic layer epitaxy
Carbon dioxide
Gas separation
membranes
Methane
Microporosity
Performance enhancement
PIM-1
Polymers
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Summary:Tailoring the microporosity of intrinsically microporous polymers at the atomic level is one of the biggest challenges in achieving high‐performance polymeric gas separation membranes. In this study, for the first time, the Al2O3 atomic layer deposition (ALD) technique was used to modify the microporosity of a typical polymer of intrinsic microporosity (PIM‐1) at the atomic level. PIM‐1 with six ALD cycles (PIM‐1‐Al2O3‐6) exhibited simultaneous high thermal, mechanical, pure‐ and mixed‐gas separation, and anti‐aging properties. The O2/N2, H2/N2, and H2/CH4 separation performances were adequate above the latest trade‐off lines. PIM‐1‐Al2O3‐6 showed CO2 and O2 permeabilities of 624 and 188 Barrer, combined with CO2/CH4 and O2/N2 selectivities of 56.2 and 8.8, respectively. This significantly enhanced performance was attributed to the strong size sieving effect induced by the Al2O3 deposition. Excellent gas separation performance and suitable stability and mechanical properties are simultaneously obtained via Al2O3 atomic layer deposition on PIM‐1 membranes owing to the strong molecular sieving effect induced by Al2O3 deposition that tailors the polymer microporosity.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202016901