Investigation of fluorosilicone polyacrylate film forming behavior on steel and PET substrates

• Surface properties of fluorosilicone polyacrylate latex film are studied.
• Migration ability of fluorine is limited by silicon crosslinking reaction.
• Migration behavior of fluorine and silicon is affected by polarity of the substrate.
• Silicon containing groups are film–substrate interface enriched.
• Silicon crosslinking reactions are favored by a high film forming temperature.

Aggregation behavior of fluorine- and silicon-containing segments in fluorosilicone polyacrylate film formed on steel and PET (polyethylene terephthalate) substrates has been investigated. Surface composition and topography of the films were characterized by ATR-FTIR spectrometry, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Effect of film forming temperatures on surface morphology and water repellency has been evaluated. The results indicated that migration behavior of fluorine- and silicon-containing segments were significantly influenced by polarity of the substrates and film forming temperatures. Fluorine content at the film–steel interface was 0.45% while it reached to 1.69% at the film–PET interface, moreover, fluorinated segments were surface enriched while silicon-containing segments were enriched at film–substrate interface. As the film forming temperature was increased, fluorine content at the film surface decreased and silicon content increased, which was due to that a high film forming temperature favored silicon crosslinking at the film surface.

Migration ability of fluorine-containing segments was limited by silicon crosslinking networks at a high film forming temperature.Figure optionsDownload as PowerPoint slide