期刊
JOURNAL OF MEMBRANE SCIENCE
卷 636, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2021.119544
关键词
PIM-1; Hydrolysis; Crosslinking; Porous polymer networks; Gas separation membrane
资金
- National Natural Science Foundation of China, China [21905008]
- Science and Technology Plan of Beijing Municipal Ed-ucation Commission, Beijing, China [KM202110011008]
Post-modification of the chemical structures of PIM-1 using methane sulfonic acid (MSA) can enhance the gas separation performance of PIM-1 membranes by improving gas pair selectivity and permeability. This method involves hydrolysis, crosslinking, and in situ synthesis of porous polymer networks (PPNs) in a one-step process, resulting in membranes with excellent CO2 separation properties.
Post-modification of the chemical structures can be used to tailor the properties of polymers of intrinsic microporosity (PIM-1), which shows promise for application of PIM-1 gas separation membrane. Methane sulfonic acid (MSA) is capable of hydrolyzing and crosslinking nitrile groups of PIM-1 to form carboxylic acidcontained and triazine groups crosslinked PIM-1 (cPIM-1), and simultaneously catalyze in situ synthesis of porous polymer networks (PPNs) in PIM-1 matrix. These reactions were carried out at the same time by a onestep method. Characterization of hydrolysis and crosslinking process of nitrile groups in PIM-1 was performed by ATR, XPS, solubility, and 1H NMR analysis. MSA catalyzed synthetic approach of PPNs includes the trimerization of three acetyl groups and involves a coupled process of polymerization and membrane architecture formation. Finally, the process of crosslinking and hydrolysis can provide enhanced gas pair selectivity of PIM-1 membrane (cPIM-1) while the gas permeability of the membranes (cPIM-1/PPNs) can be increased by the incorporation of PPNs microstructure networks. As a result, the optimal cPIM-1/PPNs showed Roberson's 2008 upper bound separation performance for CO2/CH4 and CO2/N2. The cPIM-1/PPN2-3% membrane demonstrated the best CO2 comprehensive separation performance with the permeability of almost 11511 Barrer, with ideal selectivity of 24.3 and 22.2 for CO2/N2 and CO2/CH4 respectively. Furthermore, the cPIM-1/PPNs membranes show excellent anti-aging properties. This indicates that MSA-catalyzed hydrolysis, crosslinking and in situ synthesis PPNs can effectively adjust the topological structure of PIM-1 membrane for CO2 separation.
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