| Summary: | 碩士 === 國立勤益科技大學 === 化工與材料工程系 === 102 === In recent years, it indicated that the electronic display panel is gradually from the plane toward curved panels. the flexible display is one of the main research and development themes. First, the most important question is how to find the appropriate flexible substrates. The types of substrates can be divided into ultra-thin glass, metal foil, and plastic substrates on the market. In this study, we used polyethersulphone (PES) as flexible substrate. Because of its lightweight, thin, flexible and impact-resistant properties, it can be used on portable or flexible panels.
Part A：Characteristics of graphene or graphene oxide / Polyethersulfone nanocomposite films
In this study, we added the graphene oxide (GO) and graphene (RG) into PES was to produce a series of GO/PES and RG/PES composite films. GO was made by Hummer’s methods, and then RG was obtained after thermal reduction process. The optical properties, the transmittance of 100GO and 100RG still maintained at 90%. The GO/PES and RG/PES composite film can enhance the pure PES film Young’s modulus. When the contents were added to 0.1% (100GO, 100RG), they have the best tensile strength. Finally, the water vapor transmission rate (WVTR) of 100GO (62.76 g-mil/m2-day) and 100RG (53.64 g-mil/m2-day) have the best values respectively. It decreased by 64% for 100GO and 69% for 100RG than pure PES. In summary, RG/PES composite films not only in mechanical properties but also in water resistance effects are more excellent than GO/PES composite films. Therefore, the proportion of the most appropriate was 100RG composite film.
Part B：The moisture barrier properties of polyethersulfone films enhanced by sputtering
We used aluminum nitride (AlN) as the target in the RF magnetron sputtering. We plated with a thin layer of AlN that used single power and two kinds of power on the PES films. Then we discussed the difference among the sample of the optical properties, the surface structure, and water vapor transmission rate. On the single power, the sample of 80W showed the best barrier properties (WVTR=25.98 g-mil/m2-day). When the power is more than 80W, the sputtering rate is increased, but the film of surface smoothness and moisture barrier properties are showing a downward trend. In this study, we observed that dual powers films have a lower water vapor transmission rate compared to a single power films. Water vapor transmission rate of A8 series films were also lower than the B8 series of films. In those films, the B6A8’s water vapor transmission rate reached the lowest 13.61 g-mil/m2-day. B6A8 decreased by 92% compared to pure PES film.
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