Self-Healing Polyurethane Elastomers Based on a Disulfide Bond by Digital Light Processing 3D Printing.

Area of Science:

• Materials Science
• Polymer Chemistry
• Additive Manufacturing

Background:

• Polyurethane elastomers are versatile materials with tunable properties.
• Self-healing materials can autonomously repair damage, extending product lifespan.
• 3D printing offers precise fabrication of complex structures.

Purpose of the Study:

• To fabricate a self-healing polyurethane elastomer using digital light processing (DLP) 3D printing.
• To evaluate the mechanical properties and self-healing efficiency of the printed elastomer.
• To explore potential applications in flexible electronics, soft robotics, and sensors.

Main Methods:

• Synthesis of a polyurethane acrylate containing disulfide bonds.
• Formulation of a photopolymer resin with reactive diluent and photoinitiators.
• Fabrication of 3D objects using DLP 3D printing.

Main Results:

• The photopolymer resin exhibited good fluidity and a high curing rate suitable for DLP printing.
• 3D printed objects displayed complex structures, high printing accuracy, and excellent self-healing ability.
• The polyurethane elastomer achieved a tensile strength of 3.39 ± 0.09 MPa and elongation at break of 400.38 ± 14.26%.
• Healing efficiency reached 95% after 12 hours at 80 °C, with the material capable of multiple healing cycles.

Conclusions:

• DLP 3D printing enables the efficient fabrication of self-healing polyurethane elastomers.
• The developed material possesses excellent mechanical properties and remarkable self-healing capabilities.
• This technology holds significant potential for applications in flexible electronics, soft robotics, and sensors.