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3D Printable Polymeric Composite Material with Enhanced Conductivity Achieved by Affinity Matching.

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Summary

Researchers developed a novel conductive composite using unsaturated polyester resin and graphene nanosheets. This material is highly conductive, 3D printable, and suitable for electromagnetic shielding and printed electronics applications.

Keywords:
direct ink writingelectrical conductivityelectromagnetic shieldinggraphene nanosheetsunsaturated polyester resin

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Polymer-based conductive composites offer advantages like light weight and low cost.
  • Challenges exist in achieving high conductivity and 3D printability simultaneously.
  • Graphene nanosheets are promising conductive fillers but require effective dispersion and network formation.

Purpose of the Study:

  • To develop a highly conductive and 3D printable polymer composite using unsaturated polyester resin and graphene nanosheets.
  • To investigate the formation of a 3D conductive network and the effect of printing-induced orientation on conductivity.
  • To evaluate the composite's performance in heat dissipation and electromagnetic shielding.

Main Methods:

  • Unsaturated polyester resin was used as the polymer matrix.
  • Graphene nanosheets were incorporated as conductive fillers and rheological modifiers.
  • Direct ink writing (DIW) 3D printing was employed to fabricate the composite structures.

Main Results:

  • A well-matched affinity between graphene and unsaturated polyester led to graphene aggregation and a 3D conductive network.
  • Shearing forces during DIW printing induced graphene nanosheet orientation, enhancing conductivity along the printing direction.
  • The composite achieved a high conductivity of 69.9 S m⁻¹ at room temperature with excellent 3D printability.

Conclusions:

  • The developed unsaturated polyester resin/graphene nanosheet composite exhibits outstanding electrical and thermal conductivity.
  • Excellent processability via DIW 3D printing was demonstrated.
  • The material shows significant potential for applications in electromagnetic shielding, printed electronics, and heat dissipation.