Polymers of Intrinsic Microporosity Having Bulky Substitutes and Cross-Linking for Gas Separation Membranes
Polymers of Intrinsic Microporosity Having Bulky Substitutes and Cross-Linking for Gas Separation Membranes
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DOI：
10.1021/acsapm.9b01193
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发表时间：
2020-02-01
影响因子：
5
通讯作者：
Li, Nanwen
中科院分区：
文献类型：
--
作者：
Chen, Xiuling;Zhang, Zhiguang;Li, Nanwen
具有非常高的自由体积的某些聚合物由于其大分子组成的形状和刚性而表现出互连空隙空间的连续网络;因此，它成为这些聚合物的固有性质，否则被视为固有微孔性（PIM）的聚合物。设计并制备了具有固有微孔的甲基化聚合物（PIM-M）、溴烷基化PIM（PIM-BM-x）和热自交联的PIM-BM-x用于气体分离性能增强。与PIM-M相比，PIM-BM-x聚合物膜表现出优异的气体分离性能，并超过了2008年的Robeson上限线，即PIM-BM-100膜对CO2/CH 4和O-2/N-2的选择性分别高达25.8和5.6。气体渗透性测试表明，交联PIM-BM-70的CO2和O-2渗透性分别为48.3和11.1 barrer，而CO2/CH 4和O-2/N-2的选择性分别为43.9和6.5。更重要的是，交联膜在高于500 psi的增塑压力下显示出优异的抗增塑能力。该值相对大于原始未交联的PIM-BM膜（100 psi）。
Certain polymers with very high free volume demonstrate a continuous network of interconnected void spaces due to the shape and rigidity of its macromolecular composition; as such, it becomes an intrinsic property for these polymers otherwise seen as polymers of intrinsic microporosity (PIM). Methylated polymers of intrinsic microporosity (PIM-M), bromoalkylated PIM (PIM-BM-x), and thermally self-cross-linked PIM-BM-x were designed and prepared for gas separation performance enhancements. The PIM-BM-x polymeric membranes demonstrated exceptional gas separation performance compared with PIM-M and surpassed the 2008 Robeson upper bound line, that is, the selectivities of PIM-BM-100 membrane for CO2/CH4 and O-2/N-2 were as high as 25.8 and 5.6, respectively. The gas permeability testing indicated that the permeability of CO2 and O-2 for the cross-linked PIM-BM-70 was 48.3 and 11.1 barrer, respectively, while the selectivities of CO2/CH4 and O-2/N-2 were, respectively, 43.9 and 6.S after self-cross linking at 300 degrees C for 5 h. More importantly, the cross-linked membrane showed excellent antiplasticization ability with a plasticization pressure higher than 500 psi. This value is relatively greater than the pristine uncross-linked PIM-BM membrane (100 psi).