Development of Novel Potencial of Plasma Polymerization Techniques for Surface Modification

Kasih, Tota Pirdo ; カシ, トタ ピルド
群馬大学工学部, 2007-03
Plasma polymerization technique includes plasma(-state) polymerization and plasma-induced graft polymerization and it is one of the most powerful method for surface modification of polymeric materials. Base on the unsolved problems that sti ll exist on the usage of plasma polymerization in industrial application, the works described in this thesis are intended to explore the application of the plasma discharge either for deposition of thin solid films using a newly developed non-equilibrium atmospheric pressure plasma torch as well as for inducing graft polymerization on plant fibers under low pressure condition. The major part of the thesis is directed toward the development of a novel non-equilibrium atmospheric pressure plasma torch with its name: CAPPLAT (Cold Atmosphere Pressure Plasma Torch) and exploring the use of it for depositing plasma polymerized films having organic and inorganic features. The torch consists of a 4 mm inner diameter metal pipe (inner electrode) surrounded by a silicone tube (dielectric) and a metal belt of 20 mm wide (outer electrode) is placed around the silicone tube at its end. The temperature of the generated plasma jet is as low as room temperature. When the rare gas was used to generate the discharge, electrical diagnostic exhibited the homogeneous glow type discharge. Optical emission spectroscopy confirmed the inclusion of air component to the plasma jet. By selecting the applied voltage and gas flow rate, a proper condition for sufficient plasma jet length could be adjusted. Applications of the torch have been realized to deposit both of organic and inorganic thin films. The organic film of plasma polymerized methyl methacrylate (PPMMA) obtained by using argon (Ar) plasma torch has been found to be chemically and spectroscopically similar to that of conventional PMMA. This could be happened when the rate of MMA-carrying Ar gas was high enough to change the filamentary character of Ar plasma to the glow-like one. For the deposition of thin film from hexamethyldisiloxne (HMDSO) monomer with the inorganic character, it was found that the plasma generated by using Ar as the working gas was more effective than helium (He) plasma in terms of both quality and deposition rate of film at the same applied power, frequency and gas composition. This could be realized by adjusting the oxygen feed through the HMDSO bubbler. Moreover, the appearance of the film could be improved when a small amount nitrogen (N2) was admixed to the Ar as a feed gas. The Ar/N2 mixed gas by the composition of 30/1 was found to result in homogeneous appearance of discharge and could deposit the SiO2-like film with better quality at the similar growth rate to the deposition by pure Ar plasma. Plasma-induced graft polymerization of methyl methacrylate (MMA) onto kenaf fiber was studied with using a low pressure non-equilibrium plasma. The graft polymerization onto plant fiber with high content of lignin was successfully achieved by introducing peroxides on the fiber through plasma treatment. Vinyl monomer was chosen in order to change the hydrophylic surface of kenaf onto hydrophobic one without sacrifying its potential bulk properties. The chemical structure and morphology of the grafted surface fiber have been characterized by FT-IR, XPS and SEM analyses. Those characterizations indicated that the kenaf fiber was partially coated by PMMA. Nevertheless, judging from the results of TG/DTG study, the graft polymerized kenaf fiber has higher thermal stability than untreated one.<br />学位記番号:工博乙85 続きを見る



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