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Coating and thermal polymerization of polyethylene oxide-based polymers on hollow fiber membranes for post-combustion CO2 capture.

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Title: Coating and thermal polymerization of polyethylene oxide-based polymers on hollow fiber membranes for post-combustion CO2 capture.
Authors: Zhao, Boxuan1 (AUTHOR), Liang, Canzeng1 (AUTHOR), Wang, Wenxuan2 (AUTHOR), Li, Sheng2 (AUTHOR), Zhang, Sui1 (AUTHOR) chezhangsui@nus.edu.sg
Source: Separation & Purification Technology. Aug2025:Part 1, Vol. 364, pN.PAG-N.PAG. 1p.
Subjects: Carbon sequestration, Separation of gases, Polyethylene oxide, Prepolymers, Molecular weights, Hollow fibers
Abstract: [Display omitted] Hollow fiber membranes exhibit a super high surface-to-volume ratio, making them attractive for gas separation applications. However, research on thin film composite (TFC) hollow fiber membranes for post-combustion carbon capture is limited, owing to the challenge of forming thin and continuous membranes on their curved surface and the compatibility between gutter layer and selective layer. In this work, we compared two preparation methods and different gutter layers to reveal the important factors in obtaining thin, defect-free coating via thermal crosslinking. Compared to no pretreatment, pretreatment of the coating solution at 60 °C increased the viscosity and molecular weight of the pre-polymers, preventing molecules from penetrating into the gutter layer, enabling higher crosslinking degree and enhancing the membrane stability. Furthermore, to enhance the compatibility between gutter layer and thiol-polydimethylsiloxane (PDMS) / polyethylene oxide (PEO) selective layer, amino PDMS and polyethylene glycol (PEG) PDMS were incorporated into pure PDMS in the gutter layer. The optimum membranes showed a CO 2 permeance of 1050 GPU and a CO 2 /N 2 selectivity of 23.5 at 25 °C and 2 barg. These findings demonstrated an approach for the fabrication of hollow fiber membranes via thermal crosslinking for post-combustion carbon capture and other gas separations. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:[Display omitted] Hollow fiber membranes exhibit a super high surface-to-volume ratio, making them attractive for gas separation applications. However, research on thin film composite (TFC) hollow fiber membranes for post-combustion carbon capture is limited, owing to the challenge of forming thin and continuous membranes on their curved surface and the compatibility between gutter layer and selective layer. In this work, we compared two preparation methods and different gutter layers to reveal the important factors in obtaining thin, defect-free coating via thermal crosslinking. Compared to no pretreatment, pretreatment of the coating solution at 60 °C increased the viscosity and molecular weight of the pre-polymers, preventing molecules from penetrating into the gutter layer, enabling higher crosslinking degree and enhancing the membrane stability. Furthermore, to enhance the compatibility between gutter layer and thiol-polydimethylsiloxane (PDMS) / polyethylene oxide (PEO) selective layer, amino PDMS and polyethylene glycol (PEG) PDMS were incorporated into pure PDMS in the gutter layer. The optimum membranes showed a CO 2 permeance of 1050 GPU and a CO 2 /N 2 selectivity of 23.5 at 25 °C and 2 barg. These findings demonstrated an approach for the fabrication of hollow fiber membranes via thermal crosslinking for post-combustion carbon capture and other gas separations. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2025.132358