| Summary: | 碩士 === 元智大學 === 化學工程與材料科學學系 === 99 === The target of this study is to use cyclonic atmospheric pressure plasma to modify poly (vinylidene fluoride) (PVDF) membrane surface. It can be divided to two parts of this study. One is to use pure argon plasma, the other is to add reactive gas to enhance argon plasma. The reactive gas of this study is water, hydrogen peroxide, oxygen and methane. It examines the influence of plasma operating parameters including in treatment time, power, argon flow rate, distance from nozzle to substrate and reactive gas flow rate. The change of PVDF membrane surface was calculated by Owens-Wendt-Rabel-Kaelble (OWRK) method. During cyclonic atmospheric pressure plasma processing, the plasma species were analyzed by optical emission spectroscopy (OES). In addition, the temperature variations of plasma were determined by infrared thermal imager.
The physical property and chemical composition change of plasma treated PVDF membranes are also discussed. The surface morphology and roughness were observed by scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). The chemical composition and element ratio of cyclonic atmospheric pressure plasma treated PVDF membrane surface were analyzed using X-ray photoelectron spectroscopy (XPS). The aging test results of cyclonic atmospheric pressure plasma treated PVDF membrane can keep up 250 hours, indicating its duration. In summary, this study determines that the cyclonic atmospheric pressure plasma efficiently improves the hydrophilicity of PVDF membrane surface.
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