表面引发原子转移自由基聚合制备梳型共聚物刷

对聚偏氟乙烯表面进行化学处理使其表面羟基化,然后与2-溴异丁酰溴反应引入表面引发剂。表面引发三甲基硅保护的甲基丙烯酸羟乙酯（HEMA—TMS）原子转移自由基聚合,在聚偏氟乙烯表面获得聚甲基丙烯酸羟乙酯（PHEMA）聚合物刷。动力学研究揭示PHEMA的接枝浓度随反应时间呈线性关系,表明表面链增长是可控或活性过程。2-溴异丁酰溴与三甲基硅氧基反应,在PHEMA聚合物刷侧链引入2-溴代酯组分。紧接着,表面引发甲基丙烯酸聚乙二醇酯（PEGMA）原子转移自由基聚合制备梳型聚合物刷。使用衰减全反射傅立叶红外光谱和X-射线光电子能谱表征修饰后PVDF表面,通过接枝梳型聚合物刷,聚偏氟乙烯薄膜表面由憎水变成高度亲水。

Controlled Grafting of Comb Copolymer Brushes on Poly(Vinylidene Fluoride) Films

Surface modification of Poly(vinylidene fluoride)(PVDF) films by well-defined comb copolymer brushes was carried out.Initiators were generated on the PVDF film surface by surface hydroxylation via chemical treatment,followed by 2-bromoisobutyration of hydroxyl groups.Poly(hydroxyethyl methacrylated)(PHEMA) brushes were first prepared by surface-initiated atom transfer radical polymerization of trimethylsilyl-protected hydroxyethyl methacrylated(HEMA-TMS) on the PVDF surface.Kinetics study showed a linear increase in the graft concentration of PHEMA with the reaction time,which was indicating that the chain growth from the surface is a "controlled" or "living" process.2-Bromoester moieties were attached to the grafted PHEMA by reaction of the trimethylsiloxyl groups with 2-bromoisobutyrate bromide.The comb copolymer brushes were subsequently prepared via surface-initiated atom transfer radical polymerization of poly(ethylene glycol) methyl ether methacrylate(PEGMA).The chemical composition and topography of the modified PVDF surfaces was characterized by attenuated total reflectance(ATR) FT-IR spectroscopy,X-ray photoelectron spectroscopy(XPS) and atomic force microscopy(AFM),respectively.Highly hydrophilic surface of densely grafted copolymers was indicated by measurement of water contact angles.