Initiator-integrated 3D printing enables the formation of complex metallic architectures

Area of Science:

• Materials Science
• Additive Manufacturing
• Polymer Chemistry

Background:

• Traditional 3D printing methods have limitations in fabricating complex metallic structures with tailored surface properties.
• Surface modification techniques are crucial for enhancing the functionality of 3D printed materials.

Purpose of the Study:

• To develop a versatile and cost-effective method for fabricating complex metallic structures using 3D printing.
• To integrate surface-initiated atomic-transfer radical polymerization (ATRP) with electroless plating for advanced material fabrication.
• To demonstrate the capability of producing ultralight cellular metals with desired architectures.

Main Methods:

• Direct integration of a bromine-containing initiator into 3D printing resin.
• Surface-initiated ATRP for polymer grafting.
• Electroless plating (ELP) with copper (Cu) and nickel (Ni) for metal coating.
• Etching of polymer templates to create ultralight cellular structures.

Main Results:

• Successfully fabricated complex metallic structures including microlattices, hollow balls, and Eiffel tower models.
• Achieved uniform Cu- and Ni-coating on intricate 3D printed designs.
• Demonstrated the fabrication of ultralight cellular metals by removing the polymer template.
• The combined approach offers a robust and scalable method for advanced material manufacturing.

Conclusions:

• The developed method synergistically combines 3D printing, ATRP, and ELP to overcome limitations in fabricating complex metallic components.
• This approach significantly expands the practical applications of 3D printing in fields like electronics, acoustics, thermal insulation, and catalysis.
• The universal, robust, and cost-effective nature of this technique positions it for widespread adoption in advanced manufacturing.