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Universal Approach for the Depolymerization of Polyamides via Photothermal Conversion.

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|April 23, 2026
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This study introduces a photothermal recycling method for polyamides (PAs), transforming plastic waste into valuable monomers. This sustainable approach efficiently breaks down PAs using visible light and carbon black, offering a promising solution for plastic pollution.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Environmental Science

Background:

  • Polyamides (PAs) are durable but persistent environmental pollutants due to their stability.
  • Recycling PAs is challenging due to high energy requirements for depolymerization.
  • Existing PA waste contributes significantly to global plastic pollution.

Purpose of the Study:

  • To develop an efficient and accessible photothermal strategy for polyamide recycling.
  • To overcome the high energy barriers associated with traditional PA breakdown methods.
  • To enable the recovery of valuable cyclic and linear monomers from PA waste.

Main Methods:

  • Utilized photothermal conversion with carbon black as a photothermal agent (PTA) under visible light.
  • Employed ring-closing depolymerization and acidic hydrolysis for PA breakdown.
  • Applied the method to various aliphatic, aromatic, and mixed PA waste streams, including pigmented postconsumer waste.

Main Results:

  • Polyamide 6 was depolymerized to ε-caprolactam with 74% yield in 10 minutes.
  • Polyamide 6,6 yielded hexamethylene diamine and adipic acid with 97% and 96% yields, respectively, in 1 hour.
  • The photothermal method effectively depolymerized pigmented PA waste by using existing pigments as PTAs.

Conclusions:

  • Photothermal conversion offers a general, rapid, and energy-efficient route for polyamide depolymerization under visible light.
  • The method achieves high monomer yields using inexpensive reagents and tolerates additives, supporting a circular plastic economy.
  • This approach presents a viable strategy for recycling diverse PA waste, mitigating environmental pollution.