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Cleavable Bio-Based Epoxy Matrix for More Eco-Sustainable Thermoset Composite Components.

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New cleavable bio-based epoxy resins offer eco-friendly alternatives with comparable properties. These recyclable composites enable efficient recovery of matrix and fibers, promoting a circular economy in materials science.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Engineering

Background:

  • Traditional thermoset epoxy resins pose end-of-life challenges.
  • Cleavable bio-based epoxy systems offer a sustainable alternative.
  • These systems enable circularity through matrix and fiber recovery.

Purpose of the Study:

  • To characterize a new commercial cleavable bio-resin formulation.
  • To evaluate its processability and recyclability in polymer composites.
  • To investigate the impact of post-curing regimes on material properties.

Main Methods:

  • Characterization of resin thermal stability and glass transition temperature (Tg).
  • Fabrication of composite laminates (glass and carbon) using vacuum-assisted resin transfer molding.
  • Evaluation of flexural behavior, microstructure, and dynamic-mechanical properties.
  • Implementation of a chemical recycling procedure for material recovery.

Main Results:

  • Non-post-cured resin exhibited the highest Tg (76.6 °C).
  • Post-curing at 100 °C enhanced crosslinking, improving flexural strength by 3% (carbon) and 12% (glass).
  • Post-curing at 140 °C negatively impacted mechanical performance.
  • Successful recovery of thermoplastic-based resin and fibers was demonstrated.

Conclusions:

  • The cleavable bio-resin formulation is suitable for fabricating fully recyclable polymer composites.
  • Optimized post-curing (100 °C) enhances composite mechanical properties.
  • The developed recycling process confirms the feasibility of a circular economy approach for these materials.