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High Molar Mass Polycarbonates as Closed-Loop Recyclable Thermoplastics.

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This study introduces a novel Mg(II)Co(II) catalyst for efficient carbon dioxide (CO2) copolymerization, producing high molar mass recyclable polycarbonates. The new catalyst enables tunable properties and effective depolymerization, offering a sustainable alternative for polymer manufacturing.

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Area of Science:

  • Polymer Chemistry
  • Organometallic Catalysis
  • Sustainable Materials

Background:

  • Reducing greenhouse gas emissions in polymer manufacturing is crucial.
  • Carbon dioxide (CO2) utilization via ring-opening copolymerization (ROCOP) offers a pathway to CO2-derived polycarbonates.
  • Efficient catalysts for high molar mass polycarbonates and their structure-property relationships remain underinvestigated.

Purpose of the Study:

  • To develop efficient catalysts for high molar mass polycarbonates from CO2.
  • To elucidate structure-property relationships, processing, and recyclability of these novel polycarbonates.
  • To explore the potential of CO2-based thermoplastics as sustainable alternatives.

Main Methods:

  • Development of a new organometallic Mg(II)Co(II) catalyst.
  • Ring-opening copolymerization (ROCOP) of CO2 with various bicyclic epoxides.
  • Characterization of resulting polycarbonates including molecular weight, thermal properties (Tg, Td), and rheological behavior.
  • Assessment of recyclability through reprocessing and catalytic depolymerization.

Main Results:

  • The Mg(II)Co(II) catalyst demonstrated high productivity, low loading tolerance, and excellent polymerization control.
  • High molar mass polycarbonates (Mn > 100 kg mol-1) were synthesized, including PCHC, PvCHC, PeCHC, and PCPC.
  • These amorphous thermoplastics exhibit high glass transition temperatures (85–126 °C) and thermal stability (>260 °C).
  • Poly(cyclopentene carbonate) (PCPC) showed significantly lower entanglement molecular weight and viscosity compared to PCHC.
  • All synthesized polymers were fully recyclable via reprocessing or catalytic depolymerization.

Conclusions:

  • The novel Mg(II)Co(II) catalyst enables the efficient synthesis of high molar mass, recyclable polycarbonates from CO2.
  • Tunable material properties can be achieved by varying the cyclic ring substituents.
  • PCPC demonstrates promising thermoplastic potential due to its favorable rheological properties.
  • The developed catalytic system facilitates both polymer synthesis and selective depolymerization, promoting a circular economy for plastics.