3D Printing of Highly Stretchable and Tough Hydrogels into Complex, Cellularized Structures

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Developing advanced hydrogels with enhanced mechanical properties is crucial for tissue engineering applications.
• Natural cartilage has excellent toughness and elasticity, serving as a benchmark for biomaterial development.

Purpose of the Study:

• To develop a 3D printable, highly stretchable, and tough hydrogel with potential for cartilage tissue engineering.
• To investigate the synergistic effects of poly(ethylene glycol) and sodium alginate on hydrogel properties.
• To assess the biocompatibility and cell viability within the developed hydrogel matrix.

Main Methods:

• Synthesized a novel hydrogel by combining poly(ethylene glycol) and sodium alginate.
• Incorporated biocompatible nanoclay to enable 3D printing without support material.
• Evaluated hydrogel mechanical properties, including toughness and stretchability.
• Assessed encapsulated cell viability and deformation over a 7-day culture period.

Main Results:

• The poly(ethylene glycol)-sodium alginate hydrogel exhibited superior toughness compared to natural cartilage.
• The hydrogel demonstrated high stretchability and maintained cell viability (>90%) over 7 days.
• The addition of nanoclay facilitated 3D printing of complex shapes without support structures.

Conclusions:

• A novel, 3D printable, tough, and stretchable hydrogel was successfully developed.
• The material shows significant promise for applications in cartilage repair and tissue engineering.
• The synergistic formulation offers a versatile platform for creating advanced biomaterials.