Leveraging Free Volume Manipulation to Improve the Membrane Separation Performance of Amine‐Functionalized PIM‐1

Gas‐separation polymer membranes display a characteristic permeability–selectivity trade‐off that has limited their industrial use. The most comprehensive approach to improving performance is to devise strategies that simultaneously increase fractional free volume, narrow free volume distribution, a...

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Veröffentlicht in:Angewandte Chemie (International ed.) 2021-03, Vol.60 (12), p.6593-6599
Hauptverfasser: Mizrahi Rodriguez, Katherine, Lin, Sharon, Wu, Albert X., Han, Gang, Teesdale, Justin J., Doherty, Cara M., Smith, Zachary P.
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container_issue 12
container_start_page 6593
container_title Angewandte Chemie (International ed.)
container_volume 60
creator Mizrahi Rodriguez, Katherine
Lin, Sharon
Wu, Albert X.
Han, Gang
Teesdale, Justin J.
Doherty, Cara M.
Smith, Zachary P.
description Gas‐separation polymer membranes display a characteristic permeability–selectivity trade‐off that has limited their industrial use. The most comprehensive approach to improving performance is to devise strategies that simultaneously increase fractional free volume, narrow free volume distribution, and enhance sorption selectivity, but generalizable methods for such approaches are exceedingly rare. Here, we present an in situ crosslinking and solid‐state deprotection method to access previously inaccessible sorption and diffusion characteristics in amine‐functionalized polymers of intrinsic microporosity. Free volume element (FVE) size can be increased while preserving a narrow FVE distribution, enabling below‐upper bound polymers to surpass the H2/N2, H2/CH4, and O2/N2 upper bounds and improving CO2‐based selectivities by 200 %. This approach can transform polymers into chemical analogues with improved performance, thereby overcoming traditional permeability–selectivity trade‐offs. A protection/deprotection strategy was developed to enhance the separation performance of amine‐functionalized PIM‐1. Thermal deprotection yielded a synergistic boost in size‐sieving and CO2 diffusion, ultimately surpassing the H2/CH4, O2/N2 and H2/N2 upper bounds and boosting CO2 permeability by 200 %.
doi_str_mv 10.1002/anie.202012441
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source Wiley Online Library All Journals
subjects amines
Carbon dioxide
Crosslinking
gas separations
Industrial applications
Membrane permeability
Membrane separation
Membranes
Microporosity
microporous materials
Permeability
Polymers
Selectivity
Separation
solid-state functionalization
Sorption
Upper bounds
title Leveraging Free Volume Manipulation to Improve the Membrane Separation Performance of Amine‐Functionalized PIM‐1
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