Learning from Natural Nacre: Constructing Layered Polymer Composites with High Thermal Conductivity

Area of Science:

• Materials Science
• Polymer Composites
• Nanotechnology

Background:

• Naturally layered materials like nacre exhibit excellent structural and thermal properties.
• Developing efficient thermally conductive polymer composites is crucial for modern electronics thermal management.
• Existing composites often face challenges in balancing thermal conductivity with electrical insulation.

Purpose of the Study:

• To create a bioinspired polymer composite with high thermal conductivity.
• To utilize Al2O3 platelets and silver nanoparticles (AgNPs) for enhanced thermal pathways.
• To achieve a nacre-like brick-and-mortar structure for improved material performance.

Main Methods:

• Fabrication of epoxy resin composite reinforced with Al2O3 platelets coated with AgNPs.
• Hot-pressing technique to stack Al2O3 platelets into a brick-and-mortar structure.
• Characterization of the composite's thermal conductivity and electrical insulation properties.

Main Results:

• Achieved a maximum thermal conductivity of 6.71 W m⁻¹ K⁻¹ with 50 wt% filler.
• The AgNPs acted as conductive bridges between Al2O3 platelets, enhancing thermal transfer.
• Minimal impact on electrical insulation with only 0.6 wt% AgNPs addition.

Conclusions:

• The bioinspired, nacre-mimicking composite demonstrates significant potential for thermal management applications.
• This approach offers a viable strategy for designing high-performance thermally conductive and electrically insulating materials.
• The developed composite is suitable for thermal management in modern electronic devices.