Anomalous Structural Changes and Gas Transport Properties in Ultrathin Films of Polymers of Intrinsic Microporosity
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2024_TL_Macromolecules.pdf
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Accepted version
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1.11 MB
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Author(s)
Lee, Tae Hoon
Jang, Jun Kyu
Lee, Byung Kwan
Wu, Wan-Ni
Smith, Zachary P
Park, Ho Bum
Date Issued
November 26, 2024
Journal
Macromolecules
Publisher
American Chemical Society
Citation
Anomalous Structural Changes and Gas Transport Properties in Ultrathin Films of Polymers of Intrinsic Microporosity. Tae Hoon Lee, Jun Kyu Jang, Byung Kwan Lee, Wan-Ni Wu, Zachary P. Smith, and Ho Bum Park. Macromolecules 2024 57 (23), 11242-11250.
Version
Author's final manuscript
Abstract
Solution-processable polymers of intrinsic microporosity (PIMs) have been explored as a next-generation material for the synthesis of CO2 capture membranes. Herein, we highlight the critical need for understanding the transition from bulk PIM materials (50–150 μm) to their thin films (<3 μm). 6FDA-DAM and PIM-1 were chosen as archetypal PIMs, and their thin-film composite (TFC) membranes were prepared via a spin-coating method. Interestingly, the PIM-based TFC membranes always exhibited lower gas permeabilities compared to the model predictions based on their bulk films. Moreover, such deviations became more pronounced by reducing the selective layer thickness to several tens of nanometers. Two-dimensional grazing-incidence wide-angle X-ray scattering (2D GIWAXS) analyses reveal that the PIM thin films significantly differ from those of bulk films by showing thickness-dependent anisotropic microstructures potentially due to fast solvent evaporation and confinement effects during film preparation. Also, physical aging significantly affects the microstructures and the CO2 capture performance of the aged PIM films, which should be decoupled from the effects of film thickness.
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DOI of Published Version
https://doi.org/10.1021/acs.macromol.4c01712
