Synthesis and Properties of Cationic Core-Shell Fluorinated Polyurethane Acrylate

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Science

Background:

• Development of high-performance coatings requires advanced polymer composites.
• Waterborne polyurethane (PU) systems offer environmentally friendly solutions.
• Fluorinated polymers enhance surface properties like hydrophobicity and chemical resistance.

Purpose of the Study:

• To synthesize and characterize a novel core-shell fluorinated polyurethane acrylate (FPUA) composite emulsion.
• To investigate the impact of varying core-shell ratios on FPUA film properties.
• To evaluate the potential of FPUA for advanced coating applications.

Main Methods:

• Core-shell emulsion polymerization using vinyl-capped cationic waterborne polyurethane (CWPU) as seed.
• Synthesis involved isophorone diisocyanate (IPDI), polycarbonate diol (PCDL), N-methyldiethanolamine (MDEA), and hydroxyethyl methacrylate (HEMA).
• Characterization included transmission electron microscopy (TEM), atomic force microscopy (AFM), tensile testing, and contact angle measurements.

Main Results:

• FPUA emulsions exhibited highest stability at 30-50% fluorinated acrylate (PA) content, showing distinct core-shell structures.
• Tensile strength reached 23.35 MPa at 30% PA.
• Films with 50% PA displayed 14.75% surface fluorine content and a contact angle of 98.5°, indicating significant hydrophobicity.

Conclusions:

• The core-shell ratio significantly influences FPUA film properties, including mechanical strength, surface characteristics, and thermal stability.
• Optimized FPUA films demonstrate excellent hydrophobicity, mechanical robustness, flexibility, adhesion, and corrosion resistance.
• These findings highlight the potential of FPUA composites for high-performance, durable coatings.