【摘要】 采用巯基乙醇作链转移剂,将丙烯酸十二氟庚酯与其它乙烯基单体经溶液自由基聚合,合成分子量为6 000左右含有1个端羟基的大分子单体。大分子单体与端异氰酸酯基亲水改性的聚氨酯预聚体反应获得聚含氟丙烯酸酯-聚氨酯-聚含氟丙烯酸酯A-B-A型三嵌段共聚物。将此共聚物分散在水中获得含氟嵌段共聚物水基分散体。电子显微镜观察表明,三嵌段共聚物分散体具有核壳结构;其干燥膜结构中含氟丙烯酸酯链段形成微区分布在聚氨酯连续相中;采用ATR和XPS分析技术及表面接触角研究表明,在膜材料表面形成了主要由含氟丙烯酸酯链段组成的界面。更多还原

【Abstract】 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.更多还原