摘要
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。
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） FTIR 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.
出处
《南昌大学学报（理科版）》
CAS
北大核心
2006年第3期273-278,共6页
Journal of Nanchang University(Natural Science)
基金
国家自然科学基金资助项目(50403016)
