Supramolecular and Physically Double-Cross-Linked Network Strategy toward Strong and Tough Elastic Fibers

Area of Science:

• Materials Science
• Polymer Chemistry
• Supramolecular Chemistry

Background:

• Strength and toughness are typically opposing material properties.
• Nature achieves strong and tough materials using sacrificial bonds.
• Developing elastomers with both high strength and toughness remains a challenge.

Purpose of the Study:

• To create strong and tough elastic fibers using a novel multiblock copolymer (mBCP) approach.
• To incorporate sacrificial bonds into poly(ether ester) mBCP elastomers via terpyridine moieties and Fe(II) coordination.
• To investigate the resulting material properties, including tensile strength, toughness, and self-healing.

Main Methods:

• Synthesis of a four-component multiblock copolymer (mBCP) incorporating terpyridine moieties.
• Coordination of the mBCP with Fe(II) ions to form supramolecular cross-links.
• Characterization of the mechanical properties (tensile strength, toughness) and self-healing behavior of the resulting elastomers.

Main Results:

• The developed elastic fibers exhibit a double-cross-linked network structure.
• Achieved high tensile strength (approx. 300 MPa) and toughness (approx. 100 MJ m⁻³).
• Demonstrated excellent resilience and enhanced self-healing properties.

Conclusions:

• The metal-ligand sacrificial bond strategy effectively enhances the strength and toughness of mBCP elastomers.
• This approach provides a promising route for designing advanced materials with superior mechanical performance.
• The developed elastic fibers show potential for applications requiring high strength, toughness, and self-healing.