Characterization of Pyrazoline Organic Nanoparticles Encapsulated with Poly(Methyl Methacrylate-co-Ethylene Glycol Dimet
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0965-S02-07
Characterization of Pyrazoline Organic Nanoparticles Encapsulated with Poly(Methyl Methacrylate-co-Ethylene Glycol Dimethacrylate) for Color Electronic Paper Hyo Sim Kang1, Sun Wha Oh2, and Young Soo Kang1 1 Chemistry, Pukyong National University, 599-1 Daeyon 3-Dong, Namgu, Busan, 608-737, Korea, Republic of 2 Basic Science Research Institute, Pukyong National University, 599-1 Daeyon 3-Dong, Namgu, Busan, 608-737, Korea, Republic of
ABSTRACT 1-Phenyl-3-naphthyl-5-((dimethylamino)phenyl)-2-pyrazoline with different diameters of 40 - 190 nm were prepared by the reprecipitation method and polymerized with poly(methyl methacrylate-co-ethylene glycol dimethacrylate) using cationic surfactants for full color electronic paper, which is expected to substitute for the future display. The electronic ink particles of pyrazoline organic nanoparticles polymerized by poly(methylmethacrylate-coethylene glycol dimethacrylate) were prepared and monodispersed successfully in aqueous alcohol medium. The size of mono-dispersed electronic ink particles is from 160 to 550 nm. The ink particle size was found to decrease with increasing concentration of the surfactant. The effect of surfactant was significant. The appropriate additions of surfactants result in an increase in electrophoretic mobility. The electrophoretic mobility of the resulting electronic inks was -7.5 to -3.6 x 10-5 cm2/ V∙s in the presence of surfactants.
INTRODUCTION Electronic papers (e-papers) have recently been of great interest for applications in information displays requiring low cost, lightweight, flexibility, and low power consumption [15]. There are several reasons for such low power consumption. First of all, electronic ink displays are fully reflective devices and requires no backlights. Second, the generation of the image is based on a bistable mechanism, which does not require power consumption for image retention. The term bistability means that even if the external power turns off, the recorded image remains without power consumption. This bistability is one of the most representative properties for electronic ink displays, providing the electronic ink displays with a competitive edge compared with other display technologies. Colored electronic inks have attracted much attention because the fineness or resolution of the image is strongly dependent on the quality of ink, since full-color images capable of electrophoretic display systems are on the horizon. The enhancement of image quality requires that electronic inks have a very small particle size within a narrow size distribution. Since smaller particle sizes together with uniform size distribution can impart a much more even charge on the particles, the image control becomes more precise and responsive within the given driving voltage. Thus, the particle size and size distribution are key parameters determining the quality of electronic inks. The selection of the polymerization method depends on the expected size and size distribution of the electronic ink particles. With the dispersi
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