Sequential Multimaterial Additive Manufacturing of Functionally Graded Biopolymer Composites.

Area of Science:

• Materials Science and Engineering
• Biotechnology
• Additive Manufacturing

Background:

• Cellulose, chitin, and pectin are abundant natural polymers with limited large-scale additive manufacturing applications.
• Current methods often require extensive refinement or plastic additives for biopolymer processing.
• A need exists for advanced digital fabrication techniques for multimaterial biopolymer composites.

Purpose of the Study:

• To develop a novel computational and digital fabrication workflow for multimaterial 3D printing of biopolymers.
• To enable the creation of biopolymer composites with continuously graded transitional zones.
• To demonstrate the fabrication of structures across various length scales using a single extruder.

Main Methods:

• Sequential multimaterial additive manufacturing (SMAM) workflow.
• Computational design and digital fabrication system.
• Fabrication of biopolymer composites with graded transitions using a single extruder.

Main Results:

• Successfully fabricated multimaterial biopolymer structures from millimeters to meters in scale.
• Transitional regions exhibited mechanical properties comparable to homogenous mixtures.
• Demonstrated a flexible and novel approach to additive manufacturing with abundant biopolymers.

Conclusions:

• The developed computational and digital fabrication workflow enables advanced multimaterial additive manufacturing of biopolymers.
• This method overcomes limitations of current biopolymer processing, allowing for graded material compositions.
• The approach offers diverse potential applications in various fields requiring advanced material fabrication.