Thin-film composite membranes based on hyperbranched Poly(ethylene oxide) for CO2/N2 separation
Thin-film composite membranes based on hyperbranched Poly(ethylene oxide) for CO2/N2 separation
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DOI：
10.1016/j.memsci.2021.120184
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发表时间：
2021-12
影响因子：
9.5
通讯作者：
Gengyi Zhang;Thien N. Tran;Liang Huang;E. Deng;Adrienne K. Blevins;Wenji Guo;Yifu Ding;Haiqing Lin
中科院分区：
文献类型：
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作者：
Gengyi Zhang;Thien N. Tran;Liang Huang;E. Deng;Adrienne K. Blevins;Wenji Guo;Yifu Ding;Haiqing Lin
交联无定形聚环氧乙烷 (XLPEO) 是用于燃烧后 CO2 捕集的领先膜材料之一。例如，由聚乙二醇甲醚丙烯酸酯 (PEGMEA) 制备的 XLPEO 在 35 °C 下表现出 570 Barrer 的 CO2 渗透性和 41 的 CO2/N2 选择性。然而，这些 XLPEO 不能溶解在涂层溶液中，因此无法使用最先进的制造工艺制成薄膜复合 (TFC) 膜。在这项研究中，我们通过原子转移自由基聚合（ATRP）合成了高分子量但可溶的HPEO。这些聚合物经过彻底表征并与 XLPEO 进行了比较，包括热转变、自由体积以及纯气体吸附和渗透性能。将具有 CO2 渗透性 (540 Barrer) 和 CO2/N2 选择性 (43) 最佳组合的聚合物制成厚度薄至 506 ± 44 nm 的无缺陷 TFC 膜。当在 35°C 下接受含有水蒸气的模拟烟气超过 100 小时的挑战时，该膜显示出 850 GPU 的稳定 CO2 渗透性和 37 的 CO2/N2 选择性，与领先的商用碳捕获膜相当。
Cross-linked amorphous poly(ethylene oxide) (XLPEO) is one of the leading membrane materials for post-combustion CO2capture. For example, XLPEO prepared from poly(ethylene glycol) methyl ether acrylate (PEGMEA) exhibited CO2permeability of 570 Barrer and CO2/N2selectivity of 41 at 35 °C. However, these XLPEOs cannot be dissolved in coating solutions, making it impossible to be fabricated into thin-film composite (TFC) membranes using state-of-the-art manufacturing processes. In this study, we synthesized high molecular weight yet soluble HPEO via atom transfer radical polymerization (ATRP). These polymers were thoroughly characterized and compared with XLPEO, including thermal transitions, free volumes, and pure-gas sorption and permeation properties. A polymer with the best combination of CO2permeability (540 Barrer) and CO2/N2selectivity (43) was fabricated into defect-free TFC membranes with a thickness as thin as 506 ± 44 nm. When challenged with simulated flue gas containing water vapor at 35 °C for over 100 h, the membrane shows stable CO2permeance of 850 GPU and CO2/N2selectivity of 37, comparable to the leading commercial membranes for carbon capture.