文献类型：期刊文献

英文题名：Mechanistic insight into highly efficient gas permeation and separation in a shape-persistent ladder polymer membrane

作者：Zhou, Jianhai[1,2];Zhu, Xiang[1,2];Hu, Jun[1,2];Liu, Honglai[1,2];Hu, Ying[1,2];Jiang, Jianwen[3]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[3]Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117576, Singapore

年份：2014

卷号：16

期号：13

起止页码：6075

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000332474700024)】；

基金：This work was supported by the National Basic Research Program of China (2013CB733501), the National Natural Science Foundation of China (No. 21176066, 91334203), the 111 Project of Ministry of Education of China (No. B08021), the Fundamental Research Funds for the Central Universities of China, the FP7-PEOPLE-2013-IRSES (PIRSES-GA-2013-612230), and the National University of Singapore.

语种：英文

摘要：A fully atomistic simulation study is reported to provide mechanistic insight into the superior performance experimentally observed for a polymer membrane (Carta et al., Science, 2013, 339, 303-307). The membrane namely PIM-EA-TB is produced by a shape-persistent ladder polymer of intrinsic microporosity (PIM) with rigid bridged bicyclic ethanoanthracene (EA) and Tro " ger's base (TB). The simulation reveals that PIM-EA-TB possesses a larger surface area, a higher fraction free volume and a narrower distribution of torsional angles compared to PIM-SBI-TB, which consists of less rigid spirobisindane (SBI). The predicted surface areas of PIM-EA-TB and PIM-SBI-TB are 1168 and 746 m(2) g(-1), close to experimental values of 1120 and 745 m(2) g(-1), respectively. For five gases (CO2, CH4, O-2, N-2 and H-2), the solubility and diffusion coefficients from simulation match well with experimental data, except for H2. The solubility coefficients decrease in the order of CO2 > CH4 > O-2 > N-2 > H-2, while the diffusion coefficients increase following CH4 < CO2 < N-2 < O-2 < H-2. In terms of the separation for CO2/N-2, CO2/CH4 and O-2/N-2 gas pairs, PIM-EA-TB exhibits higher permselectivities than PIM-SBI-TA, in good agreement with experiment. From a microscopic perspective, this simulation study elucidates that the presence of bridged bicyclic units in PIM-EA-TB enhances the rigidity of polymer chains as well as the capability of gas permeation and separation, and the bottom-up insight could facilitate the rational design of new high-performance membranes.