Photografting of Hydrophilic Monomers onto Poly(tetrafluoroethylene) Films Treated with Oxygen Plasmas.
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The photograftings of hydrophilic monomers such as methacrylic acid (MAA) and 2- (dimethylamino)ethyl methacrylate (DMA) onto flat, porous, and expanded poly (tetrafluoroethylene) (f, p, and ePTFE)films, which had been treated with oxygen plasmas at 50 or 200 W beforehand, were carried out by applying UV rays emitted from a 400 W high-pressure mercury lamp in t heir aqueous monomer so lutions. The wettabilities and surface composition of the grafted PTFE films were examined as a function of the plasma output and the grafted amount. We thus established a new technique to g raft the hydrophilic monomers onto PTFE films by combining the plasma treatment and photografting. Vario us oxygen-containing functional groups including hydroperoxide groups, formed by the plasma trea tment, effectively acted as active sites for photografting. The grafted amounts increased with increa sing plasma output. For the photograftings onto pPTFE and ePTFE films, the grafted amounts more considerably increased at shorter UV-irradiation times. The photograftings onto fPTFE film are definitely limited to the surface region, and for pPTFE and ePTFE films grafted polymer chains progressed into the interior of the films along the surfaces of the pores. The contact-angle measurement and the surface analysis by ESCA reveal that the wettabilities on the grafted fPTFE surfaces became constant irrespective of monomer concentration when the fPTFE surfaces were covered with grafted polymer chains. In add ition, as the grafted amounts at which the wettabilities became constant decreased with increasing plasma output due to the formation of more oxygen-containing functional groups in the vicinity of the surface region.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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