Volume-Metallization 3D-Printed Polymer Composites

Area of Science:

• Materials Science
• Additive Manufacturing
• Nanotechnology

Background:

• 3D printing of polymers or metals allows complex structures but often lacks multifunctional performance.
• Combining polymers and metals in 3D printing is challenging due to significant differences in melting points.

Purpose of the Study:

• To develop a novel volume-metallization 3D-printed polymer composite (VMPC) with bicontinuous phases.
• To enable coupled structural and functional properties in 3D-printed materials by combining polymers and low-melting-point metals.

Main Methods:

• Fabrication of a controllable porous polymer structure using 3D printing.
• Infilling the porous structure with low-melting-point metal (LM) under vacuum-assisted low-pressure conditions.
• Characterization of the resulting VMPC for mechanical, thermal, and electrical properties.

Main Results:

• Achieved complete filling of porous structures with LM, enhancing tensile strength up to 35.41 MPa.
• Significantly improved thermal conductivity to 25.29 Wm⁻¹K⁻¹ and electrical conductivity to >10⁶ S m⁻¹.
• Demonstrated synergistic anisotropy in mechanical, thermal, and electrical properties.
• Showcased VMPC applications in 3D electronics, heat dissipation, and thermoelectric energy storage.

Conclusions:

• The developed VMPC offers a viable method for creating multifunctional 3D-printed materials by overcoming polymer-metal thermal mismatch.
• The VMPC exhibits enhanced and anisotropic properties, enabling diverse applications in advanced electronics and energy conversion.
• This approach paves the way for customized 3D-printed components with integrated structural and functional capabilities.