Controlled grafting of comb copolymer brushes on poly(tetrafluoroethylene) films by surface-initiated living radical polymerizations.
Controlled grafting of comb copolymer brushes on poly(tetrafluoroethylene) films by surface-initiated living radical polymerizations.
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DOI：
10.1021/la0485531
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发表时间：
2005-01
期刊：
影响因子：
--
通讯作者：
W. Yu;E. Kang;K. Neoh
中科院分区：
文献类型：
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作者：
W. Yu;E. Kang;K. Neoh
采用梳状共聚物刷对聚四氟乙烯（PTFE）薄膜进行了表面改性。通过射频氩等离子体预处理在聚四氟乙烯薄膜表面直接生成过氧化物引发剂，然后进行空气暴露。在链转移剂的作用下，利用过氧化氢引发剂在聚四氟乙烯（PTFE）表面进行可逆加成-破碎链转移聚合制备了聚甲基丙烯酸甘油酯（PGMA）刷。动力学研究表明，PGMA接枝浓度随反应时间的增加呈线性增加，表明从表面开始的链生长符合“受控”或“活”的过程。-溴酯部分通过环氧基团与2-溴-2-甲基丙酸反应附着在接枝的PGMA上。以聚乙二醇甲基丙烯酸甲醚和4-苯乙烯磺酸钠两种亲水性乙烯基单体为原料，通过表面引发原子转移自由基聚合制备了梳状共聚物刷。用x射线光电子能谱对改性聚四氟乙烯表面的化学成分进行了表征。
Surface modification of poly(tetrafluoroethylene) (PTFE) films by well-defined comb copolymer brushes was carried out. Peroxide initiators were generated directly on the PTFE film surface via radio frequency Ar plasma pretreatment, followed by air exposure. Poly(glycidyl methacrylate) (PGMA) brushes were first prepared by surface-initiated reversible addition-fragmentation chain transfer polymerization from the peroxide initiators on the PTFE surface in the presence of a chain transfer agent. Kinetics study revealed a linear increase in the graft concentration of PGMA with the reaction time, indicating that the chain growth from the surface was consistent with a "controlled" or "living" process. alpha-Bromoester moieties were attached to the grafted PGMA by reaction of the epoxide groups with 2-bromo-2-methylpropionic acid. The comb copolymer brushes were subsequently prepared via surface-initiated atom transfer radical polymerization of two hydrophilic vinyl monomers, including poly(ethylene glycol) methyl ether methacrylate and sodium salt of 4-styrenesulfonic acid. The chemical composition of the modified PTFE surfaces was characterized by X-ray photoelectron spectroscopy.