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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Updated: May 10, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Recycling Textiles: From Post-Consumer Polyester Garments to Materials for Injection Molding.

Sabrina Bianchi1, Michele Pinna1, Flavia Bartoli1

  • 1SPIN-PET S.r.l., Viale R. Piaggio 32, 56025 Pontedera, Italy.

Polymers
|April 28, 2025
PubMed
Summary
This summary is machine-generated.

Recycling polyester textiles into injection-moldable plastics is feasible. Color sorting impacts degradation, but chain extenders improve processability and ductility, supporting a circular economy for fashion waste.

Keywords:
chain extendercircularcompactiongarmentsmonomaterialpolyesterrecyclingtextile

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Engineering

Background:

  • The fashion industry generates substantial textile waste, primarily polyester (poly(ethylene terephthalate) - PET).
  • Current recycling methods convert garment waste into flakes, but the effect of color sorting on the aesthetic and processability of recycled plastics is not well understood.
  • Developing effective recycling strategies is crucial for a circular economy and reducing microplastic pollution.

Purpose of the Study:

  • To compare the processability and properties of recycled polyester from dark versus light color-sorted garment flakes.
  • To evaluate the efficacy of different chain extenders in improving the properties of recycled polyester during extrusion and injection molding.
  • To assess the industrial feasibility of repurposing post-consumer polyester garments for new plastic products.

Main Methods:

  • Polyester garment waste was color-sorted into dark and light fractions and converted into flakes.
  • Materials were extruded and injection molded, with commercial chain extenders (anhydride, oxazoline, epoxide) added.
  • Properties investigated included melt fluidity, injection molding shrinkage, mechanical strength, and thermal behavior.

Main Results:

  • Dark-colored recycled polyester showed significant degradation during extrusion, while light-colored material did not.
  • All tested chain extenders effectively controlled melt fluidity during reprocessing.
  • The bisoxazoline-based chain extender significantly enhanced sample ductility for both dark and light colored materials.
  • Reprocessed materials exhibited controlled melt fluidity and improved mechanical properties.

Conclusions:

  • Color sorting influences degradation during polyester recycling, with dark materials being more susceptible.
  • Chain extenders are effective in managing processability and improving the ductility of recycled polyester, regardless of initial color.
  • This recycling approach demonstrates significant potential for the industrial reuse of post-consumer textiles, supporting circular economy principles and mitigating textile waste and microplastic generation.