Ultra-Stiff Graphene Foams as Three-Dimensional Conductive Fillers for Epoxy Resin

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Conductive epoxy composites are crucial for electronics.
• Traditional composites face limitations in conductivity and mechanical properties due to low filler content.
• Achieving high filler loading in epoxy resins is challenging.

Purpose of the Study:

• To investigate the use of ultra-stiff graphene foams (uGFs) as 3D continuous conductive fillers for epoxy resins.
• To enhance the electrical conductivity and mechanical properties of epoxy composites.
• To overcome processing difficulties and property degradation associated with high filler content.

Main Methods:

• Production of dense ultra-stiff graphene foams (uGFs) monoliths using powder metallurgy.
• Incorporation of uGFs into epoxy resin to create a composite material.
• Characterization of the electrical conductivity and compressive modulus of the resulting composite.

Main Results:

• Achieved a very high filler content of 32 wt % uGFs in the epoxy composite.
• The composite exhibited high electrical conductivity (41.0 ± 6.3 S/cm).
• Demonstrated a significant improvement in compressive modulus (>1700%) compared to pure epoxy, with minimal density increase.

Conclusions:

• Ultra-stiff graphene foams serve as effective 3D continuous conductive fillers for epoxy resins.
• The developed composite offers superior electrical conductivity and mechanical reinforcement at high filler content.
• This approach provides a promising pathway for advanced conductive polymer composites with enhanced performance and processability.