A Facile Surface Functionalization Method for Polymers Using a Nonsolvent

Area of Science:

• Polymer Science
• Materials Science
• Surface Chemistry

Background:

• Surface modification of polymers is essential for expanding their applications.
• Existing methods may compromise the bulk properties of polymeric materials.
• A facile and non-damaging surface treatment is highly desirable.

Purpose of the Study:

• To develop a simple method for surface functionalization of polymers.
• To create a modified surface layer that reduces protein adsorption and platelet adhesion.
• To demonstrate the versatility of the technique on different polymer types.

Main Methods:

• Immersion of poly(methyl methacrylate) (PMMA) thin films in a methanol solution of poly(2-methoxyethyl acrylate) (PMEA).
• Characterization of the surface layer using Electron Spectroscopy for Chemical Analysis (ESCA) and Neutron Reflectometry.
• Assessment of the modified surface's behavior in aqueous environments, including protein adsorption and platelet adhesion tests.

Main Results:

• A poly(2-methoxyethyl acrylate) (PMEA) layer with a diffused interface was successfully formed on the poly(methyl methacrylate) (PMMA) surface.
• The PMEA layer exhibited significant swelling in water.
• The swollen PMEA layer effectively suppressed serum protein adsorption and platelet adhesion.
• The nonsolvent-based functionalization was also successful on polyurethane surfaces.

Conclusions:

• A facile nonsolvent-based method enables effective surface functionalization of polymers like PMMA and polyurethane.
• The modified surface exhibits reduced biofouling properties due to suppressed protein and platelet interactions.
• This technique offers a promising strategy for enhancing the biocompatibility and performance of polymeric materials without affecting their bulk characteristics.