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Interfacially initiated polymerization of epoxides: A thin-film synthesis platform for XLPEO gas separation membranes
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2024-05-03 , DOI: 10.1016/j.memsci.2024.122838
Daan Van Havere , Rhea Verbeke , Raymond Thür , Simon Van Buggenhout , Samuel Eyley , Wim Thielemans , Ivo F.J. Vankelecom

Crosslinked poly (ethylene oxide) (XLPEO) membranes are leading candidates for membrane post-combustion carbon capture, because of their high CO/N selectivity and CO permeability. However, their crosslinked nature makes it difficult to process them into thin films through conventional coating techniques. In this study, interfacially initiated chain growth polymerization of epoxides is used to circumvent the XLPEO processing challenge whilst allowing in-situ crosslinking. The interfacial design strategy yields intrinsically crosslinked, epoxide-based PEO (eXLPEO) thin-film composite gas separation (GS) membranes consisting fully of CO-philic ether bonds. An eXLPEO selective layer made from poly (ethylene glycol) diglycidyl ether was successfully deposited on a PAN support and, after introduction of densification steps and a PDMS sealing, gas selective membranes were obtained. Synthesis-structure-performance analysis revealed that multiple reaction condition combinations result in highly selective membranes with a tunable chemical structure. The best performing membranes showed CO/N separation factors of 58 at 35 °C, with a stable operation at pressures from 2 to 10 bar, and retaining a separation factor of 30 at 65 °C. However, all membranes had a low CO permeance (<10 GPU), probably due to pore impregnation of the support layer. This work demonstrates for the first time the viability of interfacial polymerization for the synthesis of thin film eXLPEO GS membranes.

中文翻译:


环氧化物的界面引发聚合:XLPEO 气体分离膜的薄膜合成平台



交联聚环氧乙烷 (XLPEO) 膜因其高 CO/N 选择性和 CO 渗透性而成为膜燃烧后碳捕获的主要候选材料。然而,它们的交联性质使得很难通过传统的涂层技术将它们加工成薄膜。在这项研究中,界面引发的环氧化物链增长聚合用于规避 XLPEO 加工挑战,同时允许原位交联。界面设计策略产生本质上交联的环氧化物基 PEO (eXLPEO) 薄膜复合气体分离 (GS) 膜,该膜完全由亲 CO 醚键组成。由聚乙二醇二缩水甘油醚制成的 eXLPEO 选择性层成功沉积在 PAN 载体上,并在引入致密化步骤和 PDMS 密封后,获得气体选择性膜。合成-结构-性能分析表明,多种反应条件组合可产生具有可调节化学结构的高选择性膜。性能最佳的膜在 35 °C 时的 CO/N 分离因子为 58,在 2 至 10 bar 的压力下稳定运行,并在 65 °C 时保持 30 的分离因子。然而,所有膜的 CO 渗透性均较低(<10 GPU),这可能是由于支撑层的孔隙浸渍所致。这项工作首次证明了界面聚合用于合成薄膜 eXLPEO GS 膜的可行性。
更新日期:2024-05-03
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