Hydrogen bond-triggered self-healing polyurea elastomers with mechanical robustness via dual-dynamic phase structure...

Area of Science:

• Polymer Science
• Materials Science
• Supramolecular Chemistry

Background:

• High-performance elastomers typically face a trade-off between self-healing capabilities and mechanical stiffness.
• Existing materials often compromise one property for the other, limiting their applications.

Purpose of the Study:

• To overcome the inherent trade-off between self-healing and mechanical stiffness in elastomers.
• To design a novel material architecture that simultaneously achieves high rigidity and efficient self-healing.

Main Methods:

• Integration of quadruple hydrogen bonds with dynamic hydrogen-bond clusters within the hard domains of polyurea.
• Creation of a dual-dynamic, decoupled phase architecture.
• Characterization of mechanical properties and self-healing efficiency.

Main Results:

• The developed polyurea exhibits a high Young's modulus of 24.2 MPa, indicating significant stiffness.
• Near-complete recovery of mechanical performance (≈100%) was achieved at 80 °C after 8 hours of healing.
• The material demonstrates rapid, thermally activated self-healing due to reversible molecular reconfiguration.

Conclusions:

• A hierarchical, synergistic hydrogen-bonding system effectively reconciles the conflicting demands of self-healing and stiffness.
• The dual-dynamic, decoupled phase architecture provides a robust strategy for designing advanced polymeric materials.
• This approach opens new avenues for creating elastomers with tailored mechanical properties and self-repair functionalities.