Composite Double-Network Hydrogels To Improve Adhesion on Biological Surfaces

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• Hydrogels are promising for biomedical applications but suffer from poor adhesion to biological tissues.
• Existing hydrogels with high mechanical strength often fail due to weak interfacial interactions with soft tissues.

Purpose of the Study:

• To design a composite double-network hydrogel with enhanced adhesion to soft biological tissues.
• To investigate the role of interfacial toughening mechanisms in improving hydrogel-tissue integration.

Main Methods:

• Fabrication of a composite double-network hydrogel using poly(ethylene glycol) dimethacrylate, alginate, and nanofibrillated cellulose.
• Characterization of hydrogel water content, mechanical properties, and adhesion strength to soft tissues.
• Analysis of interfacial crack propagation and dissipative mechanisms.

Main Results:

• The developed hydrogel possesses approximately 90% water content and exhibits robust adhesion to cartilage and meniscus.
• Adhesion strength reached approximately 130 kPa for articular cartilage, surpassing commercial tissue adhesives.
• No tissue surface modification was required, simplifying the application process.

Conclusions:

• Controlling hydrogel structure and dissipation processes is crucial for achieving strong interfacial adhesion.
• The developed hydrogel offers a promising solution for tissue repair by enabling robust integration with biological surfaces.
• This work paves the way for advanced, highly adhesive hydrogels in regenerative medicine.