Dialdehyde polyethylene glycol cross-linked poly(vinyl alcohol) membranes with enhanced CO2/N2 separation performance,Journal of Applied Polymer Science

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Dialdehyde polyethylene glycol cross-linked poly(vinyl alcohol) membranes with enhanced CO2/N2 separation performance
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-02-05 , DOI: 10.1002/app.55266
Piao Chen ₁ , Jiamin Huang ₁ , Yuming Dong ₁ , Yongfa Zhu ₂ , Liangliang Dong ₁ , Chunfang Zhang ₁ , Yunxiang Bai ₁

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The development of carbon dioxide (CO₂) separation technology is crucial for mitigating global climate change and promoting sustainable development. In this study, we successfully synthesized an array of cross-linked poly(vinyl alcohol) (PVA) membranes, xALD-PEG-ALD-c-PVA, with enhanced CO₂/N₂ separation performance by employing dialdehyde polyethylene glycol (ALD-PEG-ALD) as a cross-linker. The formation of the cross-linked network structure not only inhibits the crystallization of PVA but also disrupts hydrogen bonding and thus increases fractional free volume of PVA chains. Under the synergistic effect of these multiple factors, the cross-linked PVA membranes exhibit a significantly improved CO₂ permeability. Moreover, they maintain high CO₂/N₂ selectivity, attributing to the CO₂-philic characteristic of ethylene oxide groups in the cross-linked structure. At the ALD-PEG-ALD content of 1.6 mmol g⁻¹, the xALD-PEG-ALD-c-PVA membrane demonstrates a CO₂ permeability of 41.4 barrer and a CO₂/N₂ selectivity of 57.4 at 2 bar and 25°C. Furthermore, compared with the pristine PVA membrane, xALD-PEG-ALD-c-PVA membranes manifest superior mechanical properties and outstanding separation performance for a CO₂/N₂ (15/85, vol%) gas mixture. The excellent combination of permeability and selectivity makes xALD-PEG-ALD-c-PVA membranes highly promising for various CO₂ separation applications.

中文翻译：

具有增强CO2/N2分离性能的二醛聚乙二醇交联聚(乙烯醇)膜

发展二氧化碳（CO ₂）分离技术对于减缓全球气候变化、促进可持续发展至关重要。在这项研究中，我们成功合成了一系列交联聚（乙烯醇）（PVA）膜，x ALD-PEG-ALD- c -PVA，通过使用二醛聚乙二醇（ALD）增强了CO ₂ /N ₂分离性能。 -PEG-ALD) 作为交联剂。交联网络结构的形成不仅抑制PVA的结晶，而且破坏氢键，从而增加PVA链的自由体积分数。在多种因素的协同作用下，交联PVA膜的CO ₂渗透性显着提高。此外，它们保持高CO ₂ /N ₂选择性，这归因于交联结构中环氧乙烷基团的亲CO _2特性。当 ALD-PEG-ALD 含量为 1.6 mmol g ^-1时，x ALD-PEG-ALD- c -PVA 膜在 2 bar 和 25 压力下表现出 41.4 barrer 的 CO ₂渗透性和 57.4 的 CO ₂ /N ₂选择性。 °C。此外，与原始PVA膜相比，x ALD-PEG-ALD- c -PVA膜对CO ₂ /N ₂ (15/85，vol%)气体混合物表现出优异的机械性能和出色的分离性能。渗透性和选择性的出色结合使得x ALD-PEG-ALD- c -PVA 膜在各种 CO ₂分离应用中极具前景。

更新日期：2024-02-05

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