Fabrication of CO2 Facilitated Transport Channels in Block Copolymer through Supramolecular Assembly
Fabrication of CO2 Facilitated Transport Channels in Block Copolymer through Supramolecular Assembly
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通过超分子组装在嵌段共聚物中制造 CO2 促进传输通道
DOI：
10.3390/polym6051403
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发表时间：
2014-05
期刊：
影响因子：
5
通讯作者：
Jiang Lei
中科院分区：
文献类型：
--
作者：
Wang Yao;Shang Ying;Li Xianwu;Tian Tong;Gao Longcheng;Jiang Lei
本文设计并合成了末端分别为羧基和脒基的十二烷酸12-脒分子（M）作为CO2响应性客体分子。以嵌段共聚物聚苯乙烯-b-聚氧化乙烯（PS-b-PEO）为主体聚合物，通过氢键组装与客体分子M形成复合膜。我们尝试通过改变M的加入量来调整退火膜的相分离结构，并通过透射电子显微镜（TEM），傅立叶变换红外（FT-IR）等研究的纳米结构。结果，在TEM图像中观察到的反向蠕虫状形态的明亮的PS相在黑暗的PEO/M矩阵的PS-b-PEO/M1膜，其中EO单元与M的摩尔比为1：1。随后的气体渗透测量表明，由于有序相分离结构的形成，退火膜的气体通量显著增加。正如我们所预期的那样，当EO：M摩尔比为1：1时，所制备的PS-b-PEO/M1复合膜对湿CO2具有明显的渗透选择性，这与我们最初提出的客体分子M在CO2促进传输中起关键作用的观点一致，因为M上的脒基团可以与膜中的CO2分子发生可逆反应。这项工作提供了一个超分子的方法来制造CO2促进传输膜。
In this paper, the molecule 12-amidine dodecanoic acid (M) with ending groups of carboxyl and amidine groups respectively was designed and synthesized as CO2-responsive guest molecules. The block copolymer polystyrene-b-polyethylene oxide (PS-b-PEO) was chosen as the host polymer to fabricate a composite membrane through H-bonding assembly with guest molecule M. We attempted to tune the phase separation structure of the annealed film by varying the amount of M added, and investigated the nanostructures via transmission electron microscope (TEM), fourier transform infrared (FT-IR) etc. As a result, a reverse worm-like morphology in TEM image of bright PS phase in dark PEO/M matrix was observed for PS-b-PEO/M1 membrane in which the molar ratio of EO unit to M was 1:1. The following gas permeation measurement indicated that the gas flux of the annealed membranes dramatically increased due to the forming of ordered phase separation structure. As we expected, the obtained composite membrane PS-b-PEO/M1 with EO:M mole ratio of 1:1 presented an evident selectivity for moist CO2 permeance, which is identical with our initial proposal that the guest molecule M in the membranes will play the key role for CO2 facilitated transportation since the amidine groups of M could react reversibly with CO2 molecules in membranes. This work provides a supramolecular approach to fabricating CO2 facilitated transport membranes.
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影响因子：
5.5
作者：
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通讯作者：
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作者：
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影响因子：
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作者：
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通讯作者：
Liotta, CL
影响因子：
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作者：
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通讯作者：
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