LAUSR

Abstract A new azide modified biscatechol monomer was first obtained and characterized by single-crystal XRD, but its polymerization only afforded a low molecular weight azide-containing polymer of intrinsic microporosity (PIM-N3). The high-molecular PIM-N3 was then obtained via post-modification on PIM-Me, prepared by the fluoride-mediated PIM synthesis method developed by our group in 2015. The crosslinking temperature was set at 220 °C based on the thermogravimetric analysis (TGA) data. The thermal self-crosslinking of PIM-N3 significantly enhanced gas permeability. The 6-h crosslinked PIM-N3 (PIM-N3-6 h) exhibited the best combination of CO2 permeability, and selectivity for CO2 over N2 and CH4, traversing the 2008 Robeson upper bound.