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Area of Science:

  • Polymer Chemistry
  • Chemical Recycling
  • Sustainable Materials

Background:

  • Controlled radical polymerizations often require oxygen-tolerant strategies.
  • Achieving high monomer recovery in solution depolymerizations is challenging due to low radical concentrations and oxygen sensitivity.
  • Existing methods for depolymerizing atom transfer radical polymerization (ATRP) synthesized polymers often necessitate stringent deoxygenation.

Purpose of the Study:

  • To develop an efficient and oxygen-tolerant depolymerization method for ATRP polymers.
  • To enable high monomer recovery under open-air conditions.
  • To facilitate the chemical recycling of ATRP-synthesized polymers.

Main Methods:

  • Introduction of a volatile cosolvent to remove oxygen from the reaction mixture.
  • Performing depolymerization in an open vessel under ambient conditions.
  • Utilizing atom transfer radical polymerization (ATRP) depolymerization kinetics and oxygen probe studies.

Main Results:

  • Achieved ultrafast depolymerization (2 minutes) with high monomer retrieval (∼91% efficiency) in an open vessel.
  • Demonstrated that the volatile cosolvent effectively removes oxygen, enabling efficient open-air depolymerization.
  • Showcased versatility with various ligands and high polymer loadings (1 M) without compromising yield.

Conclusions:

  • The developed method provides a facile, efficient, and fully oxygen-tolerant route for chemically recycling ATRP-synthesized polymers.
  • This approach simplifies polymer recycling by eliminating the need for deoxygenation.
  • Enables new applications for recycled polymers through efficient monomer recovery.