Tailoring the pore size of intermolecular cross-linked PIMs-based thin-film composite hollow fiber membranes using different length cross-linkers for organic solvent nanofiltration

Yang, Eunmok; Kim, Minbeom; Liang, Yejin; Byun, Jaehyun; Kim, Hyeonseo; Kim, Jun; Choi, Heechul

doi:10.1016/j.cej.2023.145339

Chemical Engineering Journal

2023

DOI: 10.1016/j.cej.2023.145339

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Tailoring the pore size of intermolecular cross-linked PIMs-based thin-film composite hollow fiber membranes using different length cross-linkers for organic solvent nanofiltration

Eunmok Yang,

Minbeom Kim,

Yejin Liang

et al.

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2024

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Cited by 2 publications

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Rapid and Precise Molecular Nanofiltration Using Ultra‐Thin‐Film Membranes Derived from 6,6′‐Dihydroxy‐2,2′‐biphenyldiamine

Chen,

Shi,

et al. 2024

Adv Funct Materials

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A key challenge in efficient molecular separation is fabricating large‐scale, highly selective polymeric membranes with precise pore control at the molecular scale. Herein, a new contorted monomer 6,6′‐dihydroxy‐2,2′‐biphenyldiamine (DHBIPDA) is introduced as a building block to generate cross‐linked, ultra‐thin microporous nanofilms (sub‐10 nm) via interfacial polymerization, enabling rapid, and precise molecular nanofiltration. Using diacyl chloride (TPC) as the cross‐linker instead of trimesoyl chloride (TMC) significantly reduces the pore sizes within the membranes and achieves a narrower pore distribution due to a semi‐crystalline structure. The film structures are confirmed using comprehensive characterization techniques including wide‐angle X‐ray scattering (WAXS), X‐ray diffraction (XRD), positron annihilation lifetime spectroscopy (PALS), CO2 adsorption analysis, and molecular‐scale simulation. The DHBIPDA/TPC and DHBIPDA/TMC membranes achieve methanol permeance values of up to 16.4 and 15.1 LMH bar−1 coupled with molecular weight cutoffs (MWCOs) as low as 283 and 306 Da, respectively. The DHBIPDA/TPC membrane demonstrates both higher permeance and higher selectivity compared to its relatively disordered counterpart DHBIPDA/TMC, consistent with characterization data. The DHBIPDA‐derived membrane efficiently separates dye mixtures with similar molecular weights and enables effective recycling of organometallic homogeneous catalysts, suggesting its potential for industrial applications.

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Rapid and Precise Molecular Nanofiltration Using Ultra‐Thin‐Film Membranes Derived from 6,6′‐Dihydroxy‐2,2′‐biphenyldiamine

Chen,

Shi,

et al. 2024

Adv Funct Materials

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Effect of Temperature-Induced Aging on the Gas Permeation Behavior of Thin Film Composite Membranes of PIM-1 and Carboxylated PIM-1

Yu,

Foster,

Alshurafa

et al. 2024

Ind. Eng. Chem. Res.

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Polymers of intrinsic microporosity (PIMs) are a class of promising gas separation materials due to their high membrane permeabilities and reasonable selectivities. When processed into thin film composite (TFC) membranes, their high gas throughput aligns closely with industrial requirements, but they are prone to physical aging and plasticization effects. TFC membranes based on the prototypical PIM-1 and its carboxylated derivative cPIM-1 exhibit temperature-dependent gas permeation behavior, which has not been extensively studied before. In single CO 2 permeation tests, measurable physical aging occurred when the temperature was raised to 55 °C within a period of 90 min, and the aging rate accelerated as temperature was raised further. TFC membranes prepared from cPIM-1 exhibited a faster aging rate compared to PIM-1 at the same temperature. The decreased permeance could be at least partially recovered through a 5 day methanol vapor treatment. In mixed gas experiments, all membranes showed decreased permselectivities at elevated temperatures. The plasticization pressure of TFC membranes occurred at around 1 bar of CO 2 partial pressure, independent of temperature. Significant plasticization was particularly evident for cPIM-1 TFC membranes under CO 2 /CH 4 conditions with increasing temperature, which resulted in increased gas permeance for both components.

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Tailoring the pore size of intermolecular cross-linked PIMs-based thin-film composite hollow fiber membranes using different length cross-linkers for organic solvent nanofiltration

Cited by 2 publications

References 73 publications

Rapid and Precise Molecular Nanofiltration Using Ultra‐Thin‐Film Membranes Derived from 6,6′‐Dihydroxy‐2,2′‐biphenyldiamine

Rapid and Precise Molecular Nanofiltration Using Ultra‐Thin‐Film Membranes Derived from 6,6′‐Dihydroxy‐2,2′‐biphenyldiamine

Effect of Temperature-Induced Aging on the Gas Permeation Behavior of Thin Film Composite Membranes of PIM-1 and Carboxylated PIM-1

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