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Circularity in Polyamide Textiles: Enhancing Recycled Polymer Molar Mass with Carbodiimide Linear Coupling.

Graziela S Baccarin1, Mateus O Costa1, Rodrigo H Dos S Garcia2

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Summary
This summary is machine-generated.

Recycling polyamide 6 (PA6) fabrics is challenging due to hydrolysis. A carbodiimide (CDI) additive prevents degradation, significantly increasing molar mass and enabling circular economy for textiles.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Engineering

Background:

  • Textile waste, particularly polyamide 6 (PA6), presents significant environmental and economic challenges.
  • Hydrolytic degradation during recycling lowers PA6 molar mass, limiting its circularity.

Purpose of the Study:

  • To investigate the use of carbodiimide (CDI) as an antihydrolysis agent and chain extender for PA6 fabric recycling.
  • To understand the mechanisms of molar mass recovery and the effect of humidity on PA6 recycling.

Main Methods:

  • Recycling of PA6 fabrics with a CDI additive under varying humidity conditions.
  • Rheological analysis to measure molar mass changes.
  • 13C NMR and Time Domain NMR for molecular investigation.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • CDI significantly reduced PA6 degradation in both dry and humid conditions.
  • Molar mass increased by 40% (dry) and 75% (wet) with CDI.
  • NMR and DFT analyses indicated CDI promotes linear chain extension, not branching.

Conclusions:

  • CDI effectively enhances the recycling of PA6 fabrics by mitigating hydrolysis and increasing molar mass.
  • This method supports cradle-to-cradle recycling, improving textile circularity and reducing environmental impact.