ew amphiphilic block copolymers Si-EFS x composed of a poly(dimethyl siloxane) (Si) block and a poly(4-(triethyleneglycol monomethyl ether)-2,3,5,6-tetrafl uorostyrene) (EFS) block are synthesized by atom transfer radical polymerization (ATRP) starting from a bromo-terminated Si macroinitiator. Similarly, new hydrophobic block copolymers Si-FS y consisting of an Si block and a poly(pentafl uorostyrene) (FS) block are prepared for comparison. X-ray photoelectron spectroscopy (XPS) analysis on block copolymer fi lms reveals that the Si block is concentrated at the polymer–air interface, while the EFS block is located in the layers underneath. The same polymer fi lms undergo a marked surface reconstruction after immersion in water for 7 d, as probed by XPS. This phenomenon involves the exposure of the hydrophilic oxyethylenic chains to contact water. Such surface reconstruction is even more drastic when an amphiphilic block copolymer is dispersed in a cross-linked poly(dimethyl siloxane) matrix fi lm.
Surface Chemistry of Amphiphilic Polysiloxane/Triethyleneglycol-Modified Poly(pentafluorostyrene) Block Copolymer Films Before and After Water Immersion
GLISENTI, ANTONELLA;
2015
Abstract
ew amphiphilic block copolymers Si-EFS x composed of a poly(dimethyl siloxane) (Si) block and a poly(4-(triethyleneglycol monomethyl ether)-2,3,5,6-tetrafl uorostyrene) (EFS) block are synthesized by atom transfer radical polymerization (ATRP) starting from a bromo-terminated Si macroinitiator. Similarly, new hydrophobic block copolymers Si-FS y consisting of an Si block and a poly(pentafl uorostyrene) (FS) block are prepared for comparison. X-ray photoelectron spectroscopy (XPS) analysis on block copolymer fi lms reveals that the Si block is concentrated at the polymer–air interface, while the EFS block is located in the layers underneath. The same polymer fi lms undergo a marked surface reconstruction after immersion in water for 7 d, as probed by XPS. This phenomenon involves the exposure of the hydrophilic oxyethylenic chains to contact water. Such surface reconstruction is even more drastic when an amphiphilic block copolymer is dispersed in a cross-linked poly(dimethyl siloxane) matrix fi lm.
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