Dual-strategy fabrication of thin-film Pebax membranes for CO2 separation: Hydrophilic gutter layer design and solvent-induced swelling

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F25%3A43932786" target="_blank" >RIV/60461373:22340/25:43932786 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1385894725081744" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1385894725081744</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cej.2025.167335" target="_blank" >10.1016/j.cej.2025.167335</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dual-strategy fabrication of thin-film Pebax membranes for CO2 separation: Hydrophilic gutter layer design and solvent-induced swelling

Popis výsledku v původním jazyce

Fabricating polyether block amide thin-film composite (TFC) membranes for CO2 separation remains challenging due to their high viscosity, microphase separation, and strong hydrophilicity. This study introduces a dual-strategy approach for the scalable fabrication of defect-free Pebax-1657 TFC membranes: (i) hydrophilic modification of the polydimethylsiloxane (PDMS) gutter layer via polyethylene glycol (PEG) through a two-step hydrosilylation, and (ii) solvent vapor-induced swelling of both the gutter and selective layers. PEG incorporation into PDMS and the resulting increase in hydrophilicity were confirmed by 1H NMR, XPS, and contact angle measurements, while swelling solvents were optimized through systematic analysis. The PEG-grafted PDMS (PDMS-PEG) gutter layer improves interfacial compatibility and coating uniformity. Swelling with hexane and ethanol vapor increases free volume and suppresses defect formation. This strategy enabled reproducible fabrication of large-area (14 x 10 cm2) Pebax-poly(poly(ethylene glycol) methyl ether acrylate) (Pebax-PPEG-MEA) membranes. The optimized membrane exhibited a CO2 permeance of 272 gas permeation units (GPU), with CO2/O2 and CO2/N2 selectivities of 14.0 and 32.0, respectively. Under mixed-gas conditions, the membrane maintained stable performance up to 20 atm, with long-term operational stability confirmed. This work demonstrates that integrating interfacial engineering with swelling control is critical for achieving high-performance gas separation membranes. The proposed approach offers a scalable and reproducible route for producing next-generation TFC membranes for energy-efficient CO2 capture applications.

Název v anglickém jazyce

Dual-strategy fabrication of thin-film Pebax membranes for CO2 separation: Hydrophilic gutter layer design and solvent-induced swelling

Popis výsledku anglicky

Fabricating polyether block amide thin-film composite (TFC) membranes for CO2 separation remains challenging due to their high viscosity, microphase separation, and strong hydrophilicity. This study introduces a dual-strategy approach for the scalable fabrication of defect-free Pebax-1657 TFC membranes: (i) hydrophilic modification of the polydimethylsiloxane (PDMS) gutter layer via polyethylene glycol (PEG) through a two-step hydrosilylation, and (ii) solvent vapor-induced swelling of both the gutter and selective layers. PEG incorporation into PDMS and the resulting increase in hydrophilicity were confirmed by 1H NMR, XPS, and contact angle measurements, while swelling solvents were optimized through systematic analysis. The PEG-grafted PDMS (PDMS-PEG) gutter layer improves interfacial compatibility and coating uniformity. Swelling with hexane and ethanol vapor increases free volume and suppresses defect formation. This strategy enabled reproducible fabrication of large-area (14 x 10 cm2) Pebax-poly(poly(ethylene glycol) methyl ether acrylate) (Pebax-PPEG-MEA) membranes. The optimized membrane exhibited a CO2 permeance of 272 gas permeation units (GPU), with CO2/O2 and CO2/N2 selectivities of 14.0 and 32.0, respectively. Under mixed-gas conditions, the membrane maintained stable performance up to 20 atm, with long-term operational stability confirmed. This work demonstrates that integrating interfacial engineering with swelling control is critical for achieving high-performance gas separation membranes. The proposed approach offers a scalable and reproducible route for producing next-generation TFC membranes for energy-efficient CO2 capture applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

1873-3212

Svazek periodika

522

Číslo periodika v rámci svazku

October 2025

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

10

Strana od-do

167335

Kód UT WoS článku

001584443900004

EID výsledku v databázi Scopus

2-s2.0-105014033741