Clicked into Place: Biomimetic Copolymer Adhesive for Covalent Conjugation of Functionalities

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Chemistry

Background:

• Polydopamines (PDA) are versatile materials known for their adhesive properties and ability to form layers on diverse substrates.
• Developing functionalized PDA materials is crucial for advanced applications requiring specific surface properties and robust adhesion.

Purpose of the Study:

• To present a novel method for functionalizing PDA-based copolymer films using click chemistry.
• To demonstrate the strong adhesion of these copolymers to various surfaces and their capacity for covalent attachment of functional groups.
• To evaluate the antifouling properties of functionalized PDA films.

Main Methods:

• Copolymerization of azidopropyl methacrylate (AzMA), methyl methacrylate (MMA), and dopamine methacrylamide (DOMA).
• Codeposition of copolymers with (3-aminopropyl)triethoxysilane on silicon wafers, polyethylene (PE), and polytetrafluoroethylene (PTFE).
• Grafting of chitosan and rhodamine B dye onto the copolymer films via click reactions, confirmed by FTIR, AFM, and fluorescence microscopy.

Main Results:

• Successful functionalization of PDA-based copolymer films using click chemistry.
• Demonstrated strong adhesion to multiple surfaces (silicon wafers, PE, PTFE).
• Chitosan-grafted layers exhibited significant antifouling properties, reducing protein adsorption by over 90%.

Conclusions:

• PDA-based copolymers offer a viable platform for surface functionalization through click chemistry.
• The developed method allows for covalent attachment of various functional groups, enhancing material properties.
• The antifouling capabilities of these functionalized surfaces show promise for biomedical and marine applications.