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Coordination-driven structure reconstruction in polymer of intrinsic microporosity membranes for efficient propylene/propane separation

查看全文 作　　者：Yanxiong [1,2,4]Ren;Boyang [2]Chong;Wei [5]Xu;Zhengqing [6]Zhang;Lin [2]Liu;Yingzhen [2,4]Wu;Yutao [2,4]Liu;Haifei [2,4]Jiang;Xu [2,4]Liang;Hong [2,4]Wu;Hongjun [5]Zhang;Bangjiao [5]Ye;Chongli [6]Zhong;Guangwei [2,4]He;Zhongyi [1,2,3,4]Jiang 高影响力作者 机构地区：[1]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou 350207,China;[2]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;[3]Chemistry and Chemical Engineering Guangdong Laboratory,Shantou 515031,China;[4]Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China;[5]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China;[6]State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China高影响力机构 出　　处：《The Innovation》索引2022年第3卷第6期,共8页高影响力期刊 基　　金：support from the National Natural Science Foundation of China(21838008,U20B2023,21621004,and 21878215);National Key R&D Program of China(2017YFB0603400);the Chemistry and Chemical Engineering Guangdong Laboratory(Grant No.1922013);Program of Introducing Talents of Discipline to Universities(No.BP0618007)。 摘　　要：Polymers of intrinsic microporosity(PIMs),integrating unique microporous structure and solution-processability,are one class of the most promising membrane materials for energy-efficient gas separations.However,the micropores generated from inefficient chain packing often exhibit wide pore size distribution,making it very challenging to achieve efficient olefin/paraffin separations.Here,we propose a coordination-driven reconstruction(CDR)strategy,where metal ions are incorporated into amidoxime-functionalized PIM-1(AO-PIM)to in situ generate coordination crosslinking networks.By varying the type and content of metal ions,the resulting crosslinking structures can be optimized,and the molecular sieving capability of PIM membranes can be dramatically enhanced.Particularly,the introduction of alkali or alkaline earth metals renders more precise micropores contributing to superior C3H6/C3H8 separation performance.K+incorporated AO-PIM membranes exhibit a high ideal C3H6/C3H8 selectivity of 50,surpassing almost all the reported polymer membranes.Moreover,the coordination crosslinking structure significantly improves the membrane stability under higher pressure as well as the plasticization resistant performance.We envision that this straightforward and generic CDR strategy could potentially unlock the potentials of PIMs for olefin/paraffin separations and many other challenging gas separations. 关 键 词：SEPARATION POROSITY CROSSLINKING
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