Constructing High-Performance Composite Epoxy Resins: Interfacial π-π Stacking Interactions-Driven Physical Rolling...

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Composite epoxy resins suffer from an inherent trade-off between strength and toughness, limiting their widespread use.
• Developing advanced materials with superior mechanical properties and functional characteristics is crucial for technological progress.

Purpose of the Study:

• To overcome the strength-toughness compromise in epoxy resins.
• To introduce a novel strategy utilizing interfacial interactions for energy dissipation in composite materials.

Main Methods:

• Employing interfacial π-π stacking interactions to control microsphere filler behavior.
• Utilizing theoretical simulations and experimental validation to confirm the proposed mechanism.
• Investigating the mechanical properties, energy dissipation, recyclability, and repairability of the developed composite.

Main Results:

• The novel composite epoxy resin exhibited a 49.8% increase in strength and a 358.9% increase in toughness.
• The material demonstrated significantly reduced hysteresis, indicating efficient energy dissipation.
• Reversible closed-loop recyclability and rapid repair capabilities were achieved.
• Preliminary evidence of "force-temperature equivalence" was observed.

Conclusions:

• The developed strategy effectively addresses the strength-toughness dilemma in epoxy resins.
• The microsphere "rolling behavior" induced by π-π stacking is a viable mechanism for enhanced energy dissipation.
• This approach offers a new pathway for designing high-performance, sustainable composite epoxy materials with advanced functionalities.