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Measuring the Mechanical Properties of Glass Fiber Reinforcement Polymer Composite Laminates Obtained by Different Fabrication Processes
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Short Glass Fiber-Reinforced Recycled Polyethylene Terephthalate Composites for Additive Manufacturing: Modification

Izabela Irska1, Mateusz Kasprowiak2, Piotr Franciszczak3

  • 1Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology in Szczecin, 70-310 Szczecin, Poland.

Polymers
|May 27, 2026
PubMed
Summary

This study enhances recycled PET (rPET) for 3D printing by adding chain extenders and glass fibers. The resulting composites show improved processing, mechanical strength, and dimensional stability for sustainable additive manufacturing.

Keywords:
3D printingadditive manufacturingcompositesglass fiber reinforcementpolyethylene terephthalaterecycling

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Area of Science:

  • Materials Science
  • Polymer Engineering
  • Sustainable Manufacturing

Background:

  • Growing demand for sustainable manufacturing drives interest in recycling plastics like polyethylene terephthalate (PET).
  • Recycled PET (rPET) shows promise for 3D printing, but faces challenges like high shrinkage and poor mechanical properties.
  • Current limitations hinder the widespread adoption of rPET in additive manufacturing.

Purpose of the Study:

  • To develop recycled PET-based composites with improved processing, thermal, and mechanical properties for additive manufacturing.
  • To address the challenges of high processing shrinkage and poor mechanical performance in rPET 3D printing.
  • To create a viable waste-to-value conversion method using rPET.

Main Methods:

  • Producing rPET composites via twin-screw extrusion using PET flakes, chain extenders, and glass fibers (GFs).
  • Characterizing the composites' processing, thermal, thermomechanical, and mechanical properties.
  • Investigating the effect of epoxy-functional chain extenders and GF reinforcement.

Main Results:

  • Epoxy-functional chain extenders increased molecular weight and improved rPET processability.
  • GF reinforcement enhanced tensile properties in both injection-molded and FDM-manufactured parts.
  • Developed rPET systems exhibited delayed crystallization kinetics, leading to lower shrinkage and better dimensional stability.

Conclusions:

  • The developed rPET-GF composites offer favorable processing and mechanical properties for extrusion-based additive manufacturing (MEX-AM).
  • Delayed crystallization is a key advantage, promoting better interfacial adhesion and dimensional stability.
  • These findings support the use of rPET composites as a sustainable alternative in 3D printing applications.