Almost general poly(vinyl alcohol) (PVA) films were prepared by the processing of a PVA solution. For the first time, a novel poly(vinyl alcohol) (PVA) film was prepared by the saponification of a poly(vinyl acetate) (PVAc) film in a heterogenous medium. Under the same saponification conditions, the influence of saponification time on the degree of saponification (DS) was studied for the preparation of the saponified PVA film, and it was found that the DS varied with time. Optical microscopy was used to confirm the characteristics and surface morphology of the saponified PVA film, revealing unusual black globules in the film structure. The contact angle of the films was measured to study the surface properties, and the results showed that the saponified PVA film had a higher contact angle than the general PVA film. To confirm the transformation of the PVAc film to the PVA film, 1 H nuclear magnetic resonance spectroscopy, X-ray diffraction measurements, differential scanning calorimetry, and Fourier-transform infrared spectroscopy were employed.
We have accomplished the various experiments of the test panel with hexagonal shape subpixels for optimizing the luminance and efficiency characteristics of the delta color array PDP. The optimal pixel and electrode designs are obtained for the highdefinition PDP with fine pixel pitch (less than 0.7 mm) in 42-inch. The hexagonal array structure shows more improved luminous efficiency results than that of the normal delta array structure with rectangular subpixels.
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