Additive Manufacturing of Carbon Using Commodity Polypropylene.

Area of Science:

• Materials Science
• Chemical Engineering
• Polymer Science

Background:

• Carbon materials are crucial for energy storage and composites, but manufacturing complex 3D structures remains challenging.
• Existing methods lack control over macroscopic configuration, limiting applications requiring structured materials.
• On-demand fabrication of tailored carbon architectures is essential for technological advancement.

Purpose of the Study:

• To develop a simple, scalable method for producing large-scale, complex 3D carbon structures.
• To investigate the mechanism of converting 3D-printed polypropylene into carbonaceous materials.
• To demonstrate the utility of the derived carbon materials in practical applications.

Main Methods:

• Utilizing 3D-printed commercial polypropylene (PP) parts.
• Employing thermal stabilization via cracking-facilitated diffusion and crosslinking.
• Applying a subsequent pyrolysis step to convert stabilized PP into carbon.

Main Results:

• A novel mechanism for PP-to-carbon conversion was elucidated, enabling complex structure formation.
• The process demonstrated consistent product yield and controlled dimensional shrinkage.
• PP-derived carbons exhibited robust mechanical properties and excellent joule heating performance.
• The method was successfully extended to recycled PP, converting waste into value-added products.

Conclusions:

• This work offers an innovative approach to create structured carbon materials with complex geometries.
• The developed method is scalable, cost-effective, and utilizes accessible materials and technologies.
• The resulting carbon materials have broad applicability, particularly as efficient heating elements and in other technological fields.