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Intrinsically Microporous Polyesters From Betulin – Toward Renewable Materials for Gas Separation Made From Birch Bark

Authors

  • Jekaterina Jeromenok,

    1. Department of Colloid Chemistry, Max Planck, Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
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  • Winfried Böhlmann,

    1. University of Leipzig, Faculty of Physics and Geosciences, Linnéstr. 5, 04103 Leipzig, Germany
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  • Markus Antonietti,

    1. Department of Colloid Chemistry, Max Planck, Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
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  • Jens Weber

    Corresponding author
    1. Department of Colloid Chemistry, Max Planck, Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
    • Department of Colloid Chemistry, Max Planck, Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany.
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Abstract

Betulin, an abundant triterpene, can be extracted from birch bark and can be used as a renewable monomer in the synthesis of microporous polyesters. Cross-linked networks and hyperbranched polymers are accessible by an A2 + B3 reaction, with betulin being the A2 monomer and B3 being a trifunctional acid chloride. Reaction of betulin with a diacid dichloride results in linear, soluble polyesters. The present communication proves that the polyreaction follows the classic schemes of polycondensation reactions. The resulting polymers are analyzed with regard to their micro-porosity by gas sorption, NMR spectroscopy, and X-ray scattering methods. The polymers feature intrinsic microporosity, having ultrasmall pores, which makes them candidates for gas separation membranes, e.g., for the separation of CO2 from N2.

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