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Keywords:

  • polymer membranes;
  • gas separation;
  • spirobifluorene;
  • intrinsic microporosity
Thumbnail image of graphical abstract

A highly gas-permeable polymer with enhanced selectivities is prepared using spirobifluorene as the main structural unit. The greater rigidity of this polymer of intrinsic microporosity (PIM-SBF) facilitates gas permeability data that lie above the 2008 Robeson upper bound, which is the universal performance indicator for polymer gas separation membranes.