Graphene-graphite hybrid epoxy composites with controllable workability for thermal management

Area of Science:

• Materials Science
• Polymer Composites
• Nanotechnology

Background:

• Highly dense electronic devices generate significant heat, necessitating efficient thermal management solutions.
• Polymer composites with thermally conductive fillers are used as thermal interface materials to reduce contact resistance.
• Increased filler concentration enhances thermal conductivity but reduces composite workability, potentially impacting device performance.

Purpose of the Study:

• To develop a tunable hybrid polymer composite for effective thermal management in electronics.
• To balance enhanced thermal conductivity with improved workability in composite materials.
• To provide a design framework for optimizing thermal interface materials.

Main Methods:

• Fabrication of hybrid polymer composites using a combination of graphene nanoplatelets (GNPs) and graphite fillers.
• Systematic adjustment of the GNP:graphite concentration ratio and total filler concentration.
• Construction of a 'concentration-thermal conductivity-viscosity phase diagram' to map material properties.
• Fabrication and testing of a thermal interface material in a model electronic device.

Main Results:

• The hybrid composite demonstrated tunable thermal conductivity and workability by varying filler concentrations and ratios.
• The phase diagram provides a tool for selecting optimal material compositions for specific thermal management needs.
• The developed thermal interface material exhibited controllable workability and effective thermal performance.

Conclusions:

• A hybrid approach using GNPs and graphite offers a versatile solution for thermal management in electronic devices.
• The ability to fine-tune both thermal properties and workability is crucial for practical applications.
• This strategy facilitates the design of advanced materials for demanding thermal management applications.