Building interfacial compatible Por-POF/PIM-1 mixed matrix membranes for efficient CO2/N2 separation
Mixed matrix membranes(MMMs)have great potential to achieve excellent CO2 separation,while their performances are often limited by poor interfacial compatibility between fillers and matrix.Here,a rational design and facile construction of highly permeable MMMs is presented by dispersing porphyrin based porous organic framework(Por-POF)within solution-processable polymer of intrinsic microporosity(PIM-1).The pure organic nature of Por-POF enhances its interaction with the pure organic polymer matrixes,leading to good interfacial compatibility in the resultant MMMs.Porous Por-POF fillers can increase the membrane fractional free volume that enhances the membrane gas permeability.Besides,Por-POF exhibits enriched nitrogen in its pore walls that has a strong adsorption effect on CO2,thus achieving higher CO2/N2 selectivity.Gas permeations demonstrate that CO2 permeability and CO2/N2 selectivity for Por-POF/PIM-1 increased by 157％and 64％,respectively,compared with pure PIM-1.This study will further bring unique insights for the rational design and construction of high performances separation membranes.
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