Novel Fluoroalkylation of Polyester Surfaces: Grafting with Perfluoroalkanoyl Peroxides

Abstract

Perfluoroalkanoyl peroxides such as (C3F7COO)2 have been found to react with polyester film only on the surface. The modified polyester surfaces were characterized by contact angle measurements using a two-liquid phase system and by ESCA spec troscopy. These provided surface free energy values and surface atom content values as a function of reaction time. Perfluoroalkyl groups substituted on the aromatic rings of the polyester surface influenced both the dispersive component γsd of surface free energy and the polar one γSp. The surface free energies decreased with the reaction time and reached a plateau at about 1 hour. There was a large decrease in γSd. Based on the ESCA characterization, the area ratio of the F1 s peak to the O 1 s peak was linearly correlated not only to γ Sd but also to γSp.

Fluorinated Peroxides

“…216 Recently, these fluoroalkanoyl peroxides were used in the direct aromatic fluoroalkylations of the surface only of polyester film and to the surface modification of silk fabric. 217,218 Polymers bearing benzene rings such as polystyrene, poly(2,6-dimethyl-p-phenylene oxide), and poly-(diphenylacetylene) were chemically modified using fluoroalkanoyl peroxides. These fluoroalkylated polymers were shown to have higher gas permeabilities than the parent polymers.…”

“…Recently, these fluoroalkanoyl peroxides were used in the direct aromatic fluoroalkylations of the surface only of polyester film and to the surface modification of silk fabric. , …”

Surface modification of glass by end-capped fluoroalkyl-functional silanes

“…Previously, we studied the fluoroalkylation of the polyester surface and we showed that the fluoroalkyl groups introduced on the polyester surface influenced the surface free energy [19]. We also found that the F ls to 0 Is ratio as determined by XPS was linearly correlated to both and y/.…”