聚含氟丙烯酸酯-聚氨酯三嵌段共聚物水基分散体的合成及膜结构

聚含氟丙烯酸酯-聚氨酯三嵌段共聚物水基分散体的合成及膜结构;含氟丙烯酸酯;水性聚氨酯分散体;表面结构;核壳分散体

Synthesis of Tri-block co-Polymer Dispersions of Aqueous Fluorine-containing Polyacrylate and Polyurethane and Characterization of Their Film Morphologies

A hydroxyl-terminal fluorine-containing macromonomer of about 6 000 molecule weight was synthesized by radical copolymerization of dodecafluroheptyl acrylate with other vinyl monomers in the(presence) of mercaptoethanol as chain-transfer agent.A tri-block co-polymer was obtained by reacting the macromonomer with NCO-terminal prepolymer with build-in hydrophilic groups.An aqueous block co-polymer dispersion was prepared by dispersing the tri-block co-polymer in water.The TEM photograph shows that the dispersion particles have a core-shell structure,and the fluorine-containing polyacrylate forms micro domains in the continuous polyurethane phase;ART,XPS and contact angle studies show that the fluorine groups are enriched in the film surface.