Probe Into the Influence of Crosslinking on CO(2) Permeation of Membranes.
Probe Into the Influence of Crosslinking on CO(2) Permeation of Membranes.
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交联对膜CO2渗透影响的探讨
DOI：
10.1038/srep40082
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发表时间：
2017-01-04
影响因子：
4.6
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Li J;Chen Z;Umar A;Liu Y;Shang Y;Zhang X;Wang Y
交联因其独特的交联骨架而成为制备高选择性CO2分离膜的有效方法。因此，研究交联度对CO2渗透选择性的影响具有重要意义。在此，我们报告了使用可逆加成断裂链转移聚合 (RAFT) 工艺成功且简便地合成了一系列聚环氧乙烷 (PEO) 基二嵌段共聚物 (BCP)，该二嵌段共聚物与独特的可紫外交联查尔酮单元结合。与紫外线交联后的氮气 (N2) 相比，所制备的 BCP 膜表现出优异的二氧化碳 (CO2) 分离性能。重要的是，系统研究了不同比例的交联查耳酮对CO2选择性的影响，结果表明，在一定限度内，随着查耳酮比例的增加，CO2选择性明显增加。此外，通过改变交联时间研究了具有最佳嵌段比例的嵌段共聚物的CO2选择性，证实高交联度表现出更好的CO2/N2(αCO2/N2)选择性。还提出了一个可能的机理模型，揭示了交联度在气体分离过程中起着关键作用。
Crosslinking is an effective way to fabricate high-selective CO2 separation membranes because of its unique crosslinking framework. Thus, it is essentially significant to study the influence of crosslinking degree on the permeation selectivities of CO2. Herein, we report a successful and facile synthesis of a series of polyethylene oxide (PEO)-based diblock copolymers (BCP) incorporated with an unique UV-crosslinkable chalcone unit using Reversible Addition-Fragmentation Chain Transfer Polymerization (RAFT) process. The membranes of as-prepared BCPs show superior carbon dioxide (CO2) separation properties as compared to nitrogen (N2) after UV-crosslinking. Importantly, the influence of different proportions of crosslinked chalcone on CO2 selectivities was systematically investigated, which revealed that CO2 selectivities increased obviously with the enhancement of chalcone fractions within a certain limit. Further, the CO2 selectivities of block copolymer with the best block proportion was studied by varying the crosslinking time which confirmed that the high crosslinking degree exhibited a better CO2/N2 (αCO2/N2) selectivities. A possible mechanism model revealing that the crosslinking degree played a key role in the gas separation process was also proposed.
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