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Smart TPE Materials Based on Recycled Rubber Shred.

Klaudia Toczek1, Magdalena Lipińska1, Joanna Pietrasik1

  • 1Institute of Polymer and Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland.

Materials (Basel, Switzerland)
|November 13, 2021
PubMed
Summary

Recycled rubber and thermoplastic elastomers were combined to create shape memory materials. Partial curing improved mechanical properties, enabling reuse of these advanced materials in the rubber industry.

Keywords:
ethylene-1-octene thermoplastic elastomersmaterial recyclingpolymer blendsrubber shredsshape memory materials

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Area of Science:

  • Materials Science
  • Polymer Science
  • Sustainable Materials

Background:

  • Recycling ethylene-propylene-diene (EPDM) rubber shred presents challenges in maintaining material properties.
  • Thermoplastic elastomers (TPEs) offer potential as binders for recycled rubber.
  • Developing functional materials from recycled components is crucial for sustainability.

Purpose of the Study:

  • To develop thermo-responsive shape memory materials using recycled EPDM rubber shred and thermoplastic elastomers.
  • To investigate the effect of partial curing on the mechanical and viscoelastic properties of EPDM/TPE blends.
  • To evaluate the shape memory performance of the developed composite materials.

Main Methods:

  • Composite materials were prepared using recycled EPDM rubber shred and ethylene-1-octene TPEs (Engage 8180, 8411, 8452).
  • Partial curing was achieved using dicumyl peroxide to enhance mechanical properties.
  • Mechanical testing (tensile strength) and viscoelastic analysis (storage and loss modulus) were performed.
  • Shape memory behavior, including shape fixity and shape recovery, was evaluated.

Main Results:

  • Peroxide curing significantly increased tensile strength (approximately 4-fold) of EPDM/TPE blends, reaching industry-acceptable levels.
  • The incorporation of EPDM rubber shred altered the viscoelastic behavior of TPEs, increasing storage and loss moduli.
  • The RS/Engage 8411 blend exhibited higher compatibility due to lower melt viscosity, confirmed by Cole-Cole plots and morphology.
  • All EPDM rubber shred/TPE blends demonstrated shape memory behavior, with the RS/Engage 8452 blend showing high shape fixity (94%) and shape recovery (87%).

Conclusions:

  • Thermo-responsive shape memory materials can be successfully produced by combining recycled EPDM rubber shred with selectively chosen thermoplastic elastomers like ethylene-1-octene.
  • Partial curing is effective in improving the mechanical properties of these recycled blends, making them suitable for industrial applications.
  • These recycled TPE/rubber shred blends offer a sustainable pathway for material reuse, demonstrating promising viscoelastic and mechanical properties for the rubber industry.