Enhancing interchain interactions in spirobifluorene-based microporous polyimides for high-performance organic solvent nanofiltration. Jang, M., Chen, Y., Choi, J., Seo, H., Chung, Y. G., & Koh, D. Journal of Membrane Science, 733:124298, September, 2025. ![Enhancing interchain interactions in spirobifluorene-based microporous polyimides for high-performance organic solvent nanofiltration [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Organic solvent nanofiltration (OSN) is a rapidly developing membrane technology with transformative potential for purifying and separating organic compounds. Membranes made from polymers of intrinsic microporosity (PIMs) are particularly well-suited for OSN due to their intrinsic microporosity, which facilitates high solvent flux. However, PIMs are typically prone to swelling in organic solvents, leading to dilated pore structures and, consequently, low selectivity. Strengthening the interactions between the polymer chains can help to reduce this swelling. Herein, 9,9′-spirobifluorene (SBF)-based microporous polyimides are synthesized, and they exhibited relatively low degrees of swelling in organic liquids compared to prototypical PIM-1. SBF-based polyimides were fabricated into thin-film composite membranes, and one of them achieved sharp separation (selectivity up to 8.54 between solutes with a molecular weight difference of less than 200 g mol−1). The membrane's reduced swelling and improved interchain interactions enable high-resolution molecular separations in organic solvents. These results suggest that the strategy of introducing enhanced interchain interactions into PIMs could prove beneficial in addressing challenging separation processes in high-value industires.
@article{jang_enhancing_2025,
title = {Enhancing interchain interactions in spirobifluorene-based microporous polyimides for high-performance organic solvent nanofiltration},
volume = {733},
issn = {0376-7388},
url = {https://www.sciencedirect.com/science/article/pii/S0376738825006118},
doi = {10.1016/j.memsci.2025.124298},
abstract = {Organic solvent nanofiltration (OSN) is a rapidly developing membrane technology with transformative potential for purifying and separating organic compounds. Membranes made from polymers of intrinsic microporosity (PIMs) are particularly well-suited for OSN due to their intrinsic microporosity, which facilitates high solvent flux. However, PIMs are typically prone to swelling in organic solvents, leading to dilated pore structures and, consequently, low selectivity. Strengthening the interactions between the polymer chains can help to reduce this swelling. Herein, 9,9′-spirobifluorene (SBF)-based microporous polyimides are synthesized, and they exhibited relatively low degrees of swelling in organic liquids compared to prototypical PIM-1. SBF-based polyimides were fabricated into thin-film composite membranes, and one of them achieved sharp separation (selectivity up to 8.54 between solutes with a molecular weight difference of less than 200 g mol−1). The membrane's reduced swelling and improved interchain interactions enable high-resolution molecular separations in organic solvents. These results suggest that the strategy of introducing enhanced interchain interactions into PIMs could prove beneficial in addressing challenging separation processes in high-value industires.},
urldate = {2026-01-19},
journal = {Journal of Membrane Science},
author = {Jang, Min-Jun and Chen, Yu and Choi, Jihoon and Seo, Hyeokjun and Chung, Yongchul G. and Koh, Dong-Yeun},
month = sep,
year = {2025},
keywords = {Microporous polyimide, Organic solvent nanofiltration (OSN), Polymers of intrinsic microporosity (PIMs), Spirobifluorene (SBF)},
pages = {124298},
}
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However, PIMs are typically prone to swelling in organic solvents, leading to dilated pore structures and, consequently, low selectivity. Strengthening the interactions between the polymer chains can help to reduce this swelling. Herein, 9,9′-spirobifluorene (SBF)-based microporous polyimides are synthesized, and they exhibited relatively low degrees of swelling in organic liquids compared to prototypical PIM-1. SBF-based polyimides were fabricated into thin-film composite membranes, and one of them achieved sharp separation (selectivity up to 8.54 between solutes with a molecular weight difference of less than 200 g mol−1). The membrane's reduced swelling and improved interchain interactions enable high-resolution molecular separations in organic solvents. These results suggest that the strategy of introducing enhanced interchain interactions into PIMs could prove beneficial in addressing challenging separation processes in high-value industires.","urldate":"2026-01-19","journal":"Journal of Membrane Science","author":[{"propositions":[],"lastnames":["Jang"],"firstnames":["Min-Jun"],"suffixes":[]},{"propositions":[],"lastnames":["Chen"],"firstnames":["Yu"],"suffixes":[]},{"propositions":[],"lastnames":["Choi"],"firstnames":["Jihoon"],"suffixes":[]},{"propositions":[],"lastnames":["Seo"],"firstnames":["Hyeokjun"],"suffixes":[]},{"propositions":[],"lastnames":["Chung"],"firstnames":["Yongchul","G."],"suffixes":[]},{"propositions":[],"lastnames":["Koh"],"firstnames":["Dong-Yeun"],"suffixes":[]}],"month":"September","year":"2025","keywords":"Microporous polyimide, Organic solvent nanofiltration (OSN), Polymers of intrinsic microporosity (PIMs), Spirobifluorene (SBF)","pages":"124298","bibtex":"@article{jang_enhancing_2025,\n\ttitle = {Enhancing interchain interactions in spirobifluorene-based microporous polyimides for high-performance organic solvent nanofiltration},\n\tvolume = {733},\n\tissn = {0376-7388},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0376738825006118},\n\tdoi = {10.1016/j.memsci.2025.124298},\n\tabstract = {Organic solvent nanofiltration (OSN) is a rapidly developing membrane technology with transformative potential for purifying and separating organic compounds. 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