Fluoropolymer Nanoparticles Prepared Using Trifluoropropene Telomer Based Fluorosurfactants

Area of Science:

• Materials Science
• Polymer Chemistry
• Green Chemistry

Background:

• Perfluorooctanoic acid (PFOA) is a widely used but environmentally concerning fluorosurfactant.
• There is a growing need for sustainable and effective alternatives in fluorosurfactant applications.
• Fluorosurfactants are crucial for stabilizing emulsions and creating nanoparticles in various industrial processes.

Purpose of the Study:

• To synthesize a novel, environmentally friendly fluorosurfactant as a PFOA alternative.
• To characterize the properties of the synthesized fluorosurfactant, including its critical micellar concentration (CMC).
• To demonstrate the utility of the new fluorosurfactant in preparing stable fluoropolymer nanoparticles.

Main Methods:

• Synthesis of a 3,3,3-trifluoropropene (TFP) telomer using a chain transfer agent.
• Modification of the telomer's end-group and subsequent thiol-ene reaction with thioglycolic acid.
• Preparation of fluoropolymer nanoparticles via solvent evaporation of an oil-in-water emulsion stabilized by the new surfactant.

Main Results:

• The synthesized fluorosurfactant demonstrated a significantly lower CMC (0.87 g·L⁻¹) compared to PFOA (3.0 g·L⁻¹).
• Stable oil-in-water emulsions were formed, which were converted into highly stable nanoparticle suspensions after solvent evaporation.
• The strong hydrophobic interactions between the fluorinated surfactant and fluoropolymer ensured excellent colloidal stability against dialysis.

Conclusions:

• The TFP-based fluorosurfactant is a viable, greener alternative to PFOA.
• The surfactant effectively stabilizes fluoropolymer nanoparticles, showcasing its potential in advanced material applications.
• The developed method offers a pathway for producing stable fluoropolymer nanostructures with reduced environmental impact.