Synthesis, characterization, and property of amphiphilic fluorinated abc-type triblock copolymers

Abstract

Novel amphiphilic fluorinated ABC-type triblock copolymers composed of hydrophilic poly(ethylene oxide) monomethyl ether (MeOPEO), hydrophobic polystyrene (PSt), and hydrophobic/lipophobic poly(perfluorohexylethyl acrylate) (PFHEA) were synthesized by atom transfer radical polymerization (ATRP) using N,N,N′,N″,N″-pentamethyldiethylenetriamine (PMDETA)/CuBr as a catalyst system. The bromide-terminated diblock copolymers poly(ethylene oxide)-block-polystyrene (MeOPEO-b-PSt-Br) were prepared by the ATRP of styrene initiated with the macroinitiator MeOPEO-Br, which was obtained by the esterification of poly(ethylene oxide) monomethyl ether (MeOPEO) with 2-bromoisobutyryl bromide. A fluorinated block of poly(perfluorohexylethyl acrylate) (PFHEA) was then introduced into the diblock copolymer by a second ATRP process to synthesize a novel ABC-type triblock copolymer, poly(ethylene oxide)-block-polystyrene-block-poly(perfluorohexylethyl acrylate) (MeOPEO-b-PSt-b-PFHEA). These block copolymers were characterized by means of proton nuclear magnetic resonance (1H NMR) and gel permeation chromatography (GPC). Water contact angle measurements revealed that the polymeric coating of the triblock copolymer (MeOPEO-b-PSt-b-PFHEA) shows more hydrophobic than that of the corresponding diblock copolymer (MeOPEO-b-PSt). Bovine serum albumin (BSA) was used as a model protein to evaluate the protein adsorption property and the triblock copolymer coating posseses excellent protein-resistant character prior to the corresponding diblock copolymer and polydimethylsiloxane. These amphiphilic fluoropolymers can expect to have potential applications for antifouling coatings and antifouling membranes. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011