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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Related Experiment Video

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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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Self-Healing and Reprocessable Polyurethane Elastomer with Triple Dynamic Crosslinked Networks.

Xingyu Mou1, Yiqin Guo1, Xuejun Lai1

  • 1School of Materials Science and Engineering, Key Lab of Guangdong Province For High Property and Functional Polymer Materials, South China University of Technology, Guangzhou, China.

Macromolecular Rapid Communications
|August 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a self-healing and reprocessable polyurethane (PU) elastomer with triple dynamic networks. The novel material demonstrates excellent mechanical properties, high healing efficiency, and superior thermal-oxidative aging resistance, addressing key challenges in PU recycling.

Keywords:
polyurethanereprocessableself‐healingthermal‐oxidative aging resistancetriple dynamic crosslinked networks

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Materials

Background:

  • Chemically crosslinked polyurethanes (PUs) offer excellent mechanical properties but face significant recycling challenges.
  • Developing recyclable and functional PUs is crucial for sustainable material applications.

Purpose of the Study:

  • To synthesize a self-healing and reprocessable polyurethane (PU) elastomer.
  • To investigate the impact of triple dynamic networks on material properties and recyclability.

Main Methods:

  • Synthesized PU elastomer using methylenediphenyldiisocyanate, polyetheramine, protocatechualdehyde, and tris(2-aminoethyl) amine with Fe3+ ions.
  • Incorporated triple dynamic networks: hydrogen bonds, Fe3+-catechol coordination, and imine bonds.
  • Characterized mechanical properties, self-healing efficiency, reprocessability, and thermal-oxidative aging resistance.

Main Results:

  • Achieved excellent mechanical properties: tensile strength of 6.40 MPa, elongation at break of 1838%, toughness of 51.16 MJ m⁻³, and fracture energy of 154.91 kJ m⁻².
  • Demonstrated high self-healing efficiency (96.6%) and superior reprocessability (75.6% tensile strength retention after three cycles).
  • Exhibited outstanding thermal-oxidative aging resistance due to residual phenolic hydroxyl groups.

Conclusions:

  • The developed PU elastomer with triple dynamic networks offers a promising solution for recyclable and high-performance materials.
  • This methodology provides a new pathway for creating functional elastomers with enhanced durability and sustainability.
  • The material's properties address limitations in current polyurethane applications, paving the way for advanced material design.