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Keywords:

  • carbon dioxide;
  • gas adsorption;
  • microporous polymers;
  • renewable resources;
  • solid state NMR spectroscopy
Thumbnail image of graphical abstract

Separation of CO2. Microporous polyurethane networks were prepared based on a renewable resource. Betulin, extracted from birch bark, is used as a structure-directing diol monomer in A3-B2 monomers. The resulting microporous networks show very promising CO2/N2 selectivities. The state of adsorbed CO2 is analyzed by in situ NMR spectroscopy, and pure physisorption is proven. The preparation of monolithic materials is demonstrated as well.