An adhesive elastomeric supramolecular polyurethane healable at body temperature

Area of Science:

• Polymer Chemistry
• Materials Science
• Biomedical Engineering

Background:

• Developing self-healing materials is crucial for extending the lifespan and reliability of various products.
• Existing self-healing elastomers often require elevated temperatures or prolonged healing times, limiting their practical applications.
• There is a need for biocompatible and efficient self-healing materials for biomedical use.

Purpose of the Study:

• To synthesize and characterize a novel supramolecular polyurethane network with efficient self-healing capabilities at human body temperature.
• To evaluate the non-cytotoxicity and mechanical recovery of the synthesized material.
• To explore the potential biomedical applications of this self-healing material.

Main Methods:

• Synthesis of a supramolecular polyurethane network.
• Rheological analysis to study the temperature-dependent mechanical properties.
• Microscopic and mechanical characterization to assess healing efficiency and interface recovery.
• Cytotoxicity assay using human skin fibroblasts.
• Adhesion testing on pig skin.

Main Results:

• The supramolecular polyurethane network demonstrated efficient mechanical property recovery (>99%) at 37 °C.
• Rheological analysis indicated network dissociation above 37 °C, facilitating rapid viscosity decrease and healing.
• The material showed effective mechanical property recovery across damage sites with minimal interface contact.
• Cytotoxicity assays confirmed the material's non-toxic nature (cell viability >94%).
• Excellent adhesion to pig skin and complete *in situ* healing post-damage were observed.

Conclusions:

• The synthesized supramolecular polyurethane network is a promising self-healing material with efficient recovery at body temperature.
• Its non-cytotoxicity and *in situ* healing ability make it suitable for biomedical applications.
• Potential applications include artificial skin, wound dressings, and other tissue engineering scaffolds.