Towards enhanced CO2 selectivity of the PIM-1 membrane by blending with polyethylene glycol
Towards enhanced CO2 selectivity of the PIM-1 membrane by blending with polyethylene glycol
复制标题
通过与聚乙二醇混合来增强 PIM-1 膜的 CO2 选择性
DOI：
10.1016/j.memsci.2015.05.077
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发表时间：
2015-11
影响因子：
9.5
通讯作者：
Liu, Qing Lin
中科院分区：
文献类型：
--
作者：
Lin, Peng Ju;Qu, Yan;Zhu, Ai Mei;Liu, Qing Lin
具有本征微孔结构的聚合物具有较高的比表面积和微孔结构，是一种极具吸引力的气体分离膜材料。PIM-1分子筛具有极高的渗透性和中等的选择性，是最具代表性的催化剂。在本研究中，PIM-1的CO_2选择性在聚乙二醇(PEG)的作用下得到显著提高。通过改变聚乙二醇的相对分子质量和含量，制备了一系列用于分离CO2/N_2、CO_2/CH_4的PIM-1/PEG共混膜。明确表征了它们的结构和物理化学性质，包括密度、形貌和热稳定性。与纯PIM-1相比，共混膜的填充链间距较小。测定了不同相对分子质量和不同聚乙二醇量的二氧化碳、氮气和甲烷的纯气渗透率。聚乙二醇共混物降低了PIM-1膜的气体渗透率，但大大提高了CO_2选择性，尤其是对CO_2/CH_4的分离。在不同相对分子质量下，加入2.5wt%的聚乙二醇膜对CO2/CH4的分离性能优异，超过了2008年的上限。其中，聚乙二醇含量为3.5wt%、分子量为20 kDa的PIM-1膜的CO2透过率为1952 Barrer，CO2/CH4选择性为39.0，是纯PIM-1膜的3倍多。所制备的PIM-1/PEG膜具有很大的CO2分离潜力。
Polymers of intrinsic microporosity are attractive membrane materials for gas separation due to their high specific surface and microporous structure. PIM-1 being the most representative one shows extremely high permeability but moderate selectivity for CO2separation. In this study, the CO2selectivity of PIM-1 is remarkably enhancedviablending with polyethylene glycol (PEG). A series of PIM-1/PEG blended membranes are prepared for separation of CO2/N2, CO2/CH4by varying the molecular weight (MW) and content of PEG. Their structure and physicochemical properties are explicitly characterized including density, morphology and thermostability. The blended membranes have lessd-spacing of packed chains than pure PIM-1. The pure gas permeabilities of CO2, N2and CH4are measured with varying MW and content of PEG. The PEG blend depresses gas permeability of the PIM-1 membrane but greatly improves the CO2selectivity, especially for CO2/CH4separation. The membranes with 2.5 wt% PEG at different MWs have excellent separation performance for CO2/CH4separation, which surmounts the 2008 upper bound line. Specifically the membrane with 3.5 wt% PEG of 20 kDa has the CO2permeability of 1952 barrer and CO2/CH4selectivity of 39.0 that is more than three times that of the pure PIM-1 membrane. The as-prepared PIM-1/PEG membranes have a great potential for CO2separation.
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通讯作者：
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