Self-Polymerized Tough and High-Entanglement Zwitterionic Functional Hydrogels

Area of Science:

• Materials Science
• Biomedical Engineering
• Polymer Chemistry

Background:

• Zwitterionic hydrogels offer excellent biocompatibility and antifouling characteristics for biomedical applications.
• The inherent low toughness and strength of single-network zwitterionic hydrogels restrict their practical use.
• Developing mechanically robust and functional zwitterionic hydrogels is crucial for advancing biomedical technologies.

Purpose of the Study:

• To synthesize a novel zwitterionic hydrogel with superior mechanical properties and multi-functionality.
• To investigate the potential of dopamine oxidative radical polymerization in creating high-performance hydrogels.
• To explore the applicability of the developed hydrogel in advanced biomedical applications, including 3D scaffolds and electronic devices.

Main Methods:

• Preparation of a sulfobetaine methacrylate-dopamine hydrogel (SBMA-DA-PE) via dopamine oxidative radical polymerization.
• Characterization of the hydrogel's mechanical properties, including tensile and compressive stress/strain.
• Evaluation of self-healing capabilities, fatigue resistance, swellability, antifouling properties, printability, and conductivity.

Main Results:

• The SBMA-DA-PE hydrogel demonstrated a 5-fold increase in tensile fracture stress and a 10-fold increase in compressive fracture stress compared to regular zwitterionic hydrogels.
• Achieved excellent mechanical properties with maximum compressive stress ≥4.85 MPa and strain ≥90%.
• Exhibited remarkable self-healing, fatigue resistance, low swellability, good antifouling properties, printability, and conductivity.

Conclusions:

• The developed SBMA-DA-PE hydrogel overcomes the mechanical limitations of traditional zwitterionic hydrogels.
• Dopamine-mediated polymerization provides a viable route to high-performance, multi-functional zwitterionic materials.
• The unique properties of SBMA-DA-PE hydrogel open new avenues for creating advanced biological 3D scaffolds and electronic devices.