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. 2023 Sep 7;14:5483. doi: 10.1038/s41467-023-41169-x

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a AFM surface morphology and b TEM cross-sectional morphology of the QSPIP-TMC membrane. The dark region is QSPIP-TMC due to the density contrast. c Rejections of QSPIP-TMC and PIP-TMC membranes toward polyethylene glycol with different molecular weight. d, e Molecular dynamics simulation of free volume of QSPIP-TMC and PIP-TMC networks, respectively. The orange and gray color indicate the voids of polymer and occupied space of polymer skeleton. f CO₂ absorption/desorption isothermals of QSPIP-TMC and PIP-TMC. g Schematic structures of the QSPIP-TMC network. h The 3D structure of QSPIP-TMC and PIP-TMC linkage.