Real Time Measurement of Functional Groups Substitution on Fluorocarbon Surface by ATR FT-IR
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Real Time Measurement of Functional Groups Substitution on Fluorocarbon Surface by ATR FT-IR Yuki Sato and Masataka Murahara Depertment of Electrical and Electronic Engineering, Tokai University 1117 Kitakaname Hiratuka Kanagawa, 259-1292, JAPAN ABSTRACT The photochemical reaction process steps in substituting the functional groups on the surface of fluorocarbon [FEP] by irradiating an Xe2 excimer lamp on water or formic acid and FEP placed on the attenuated total reflectance [ATR] prism, has been measured in real time. These steps include, water photo-dissociation, the defluorination of the FEP and the hydrophilic group substitution. In case of formic acid, the absorption peaks of the -CHO in the region of 2940 cm-1 and the -COOH in the region of 1710 cm-1 decreased respectively by photo dissociation, but that of the -OH in the region of 3300cm-1 increased. The results indicated that the -CHO and -COOH have turned to -OH. Furthermore, the contact angle with water was measured. When compared to the untreated sample, whose contact angle was 110 degrees, the contact angle of the sample treated with water and the Xe2 lamp irradiation for 25 minutes became 31 degrees, and that of the sample modified with formic acid and the lamp irradiated for 25 minutes further improved to 17 degrees. This implies that the hydrophilic groups were produced more in formic acid than in water.
INTRODUCTION Fluororesin, which is a very chemically stable material and has several excellent properties such as heat and chemical resistance and resistance to hostile environments. It is thus employed as implant material in soft tissue as artificial blood vessels, artificial ligaments and artificial corneas. Fluororesin itself, however, is weak in tissue affinity because of its repellency. In order to improve its affinity for the tissue, Kurotobi et al. tried to incorporate oxygen atoms into expanded poly (tetrafluoroethylene) [e-PTFE] by using He+ and Ar+ ion-beam irradiation, and evaluated the treated samples by fourier transform infrared spectroscopy [FT-IR] and scanning electron microscope [SEM]. By this treatment, the e-PTFE surface was roughened and carbonyl groups and carbonization were also produced to promote the fibronectin and fibrinogen absorption [1, 2]. Suzuki et al. reported that hydrophilic property was temporarily generated on the PTFE surface by H2 O ion irradiation; XPS analysis and Cu adhesive test were carried out to investigate relationship between the PTFE surface and Cu adhesion. The results showed that the Cu adhesion was dependent on the quantity of the OH adsorption [3]. Park et al. modified the FEP surface to be hydrophilic by remote H2 , Ar, N2 and O2 plasmas, and improved the adhesion with copper [4]. We have incorporated desired functional groups or metal atoms onto various kinds of polymer surfaces using the photochemical reaction of UV-photon to generate the hydrophilic, hydrophobic or metallization surfaces [5-10]. The treated samples were investigated by XPS and FT-IR, to study the substituted hydrophili
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