Enhanced Resistance of Zwitterionic Hydrogels against Marine Fouling Using a Zwitterionic Photo Cross-Linker

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Science

Background:

• Polyzwitterions are promising for fouling-resistant hydrogel coatings in biomedical and environmental applications.
• Achieving mechanical stability in hydrogels often requires high cross-linking, which can compromise hydrophilicity.
• A novel zwitterionic methacrylate monomer with photo-cross-linkable and sulfobetaine moieties was developed to address this challenge.

Purpose of the Study:

• To synthesize and characterize novel zwitterionic methacrylate copolymers for enhanced fouling resistance.
• To investigate the mechanical properties and hydration capabilities of photocured copolymer films.
• To evaluate the protein adsorption resistance and marine biofouling reduction of the developed materials.

Main Methods:

• Synthesis of copolymers incorporating a photo-cross-linkable zwitterionic methacrylate and standard sulfobetaine methacrylate (SPe).
• Photocuring of copolymer films and analysis of their properties.
• Surface plasmon resonance spectroscopy to assess protein adsorption.
• Laboratory assays and short-term field exposures to evaluate marine biofouling.

Main Results:

• Copolymers with up to 50 mol % photo cross-linker were successfully synthesized.
• Photocured films with approximately 30 mol % cross-linker content maintained high hydration.
• Substantial reduction in marine biofouling was observed, confirmed by field tests in the ocean.

Conclusions:

• The novel photo-cross-linkable zwitterionic methacrylate enables the creation of mechanically stable yet hydrophilic hydrogel coatings.
• These advanced materials demonstrate significant potential for reducing biofouling in marine environments.
• The developed copolymers offer a promising solution for durable, fouling-resistant surfaces in demanding applications.