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Jeon H.-G.,Functional Polymer Science Course | Kondo Y.,Tokki Co. | Maki S.,Tokki Co. | Matsumoto E.,Tokki Co. | And 3 more authors.
Organic Electronics: physics, materials, applications

Here we report a highly efficient sublimation purification system using baffles with orifices in the sublimation tube. It is clearly demonstrated that the purity of materials is increased largely by introducing some pieces of baffles with orifices in the high-temperature region (sublimation region), which was confirmed by comparing the melting point (T m) and the high-performance liquid chromatography (HPLC) purity with those of purified one by a conventional system. The driving voltages of electroluminescence (EL) devices were also compared and showed the same tendency with the T m and HPLC purity data. Not only the purity but also the effective yield of purified materials was also increased by introducing baffles in low-temperature region. Some expected mechanisms of improving the purification efficiency by introducing baffles were also discussed. © 2010 Elsevier B.V. All rights reserved. Source

Itoh Y.,Functional Polymer Science Course | Sahara F.,Functional Polymer Science Course | Ozaki K.,Functional Polymer Science Course | Akasaka R.,Functional Polymer Science Course | Teramoto A.,Functional Polymer Science Course
Polymer Bulletin

Emulsion polymerizations of several vinyl monomers, styrene, methyl methacrylate, butyl methacrylate, butyl acrylate, and vinyl acetate, in water using alkali-hydrolysable cationic surfactants with a betaine ester group (1-alkoxycarbonylmethyl) trimethylammonium chlorides, as emulsifiers were carried out and properties of the resulting latices and the polymers recovered by hydrolysis and salting out were investigated. There were little influences of the surfactants and monomers used here on the polymerizations, forming stable and monodisperse latices with a mean diameter of ca. 70 nm and giving a high molecular weight of polymers at high yields. All polymers were precipitated and recovered by adding a small amount of sodium hydroxide into the latex solutions contained little amount of ionic species. Solvent-cast films of the polymers were found to have surfaces as hydrophobic as those for the corresponding pure polymers prepared by bulk polymerization. © Springer-Verlag 2011. Source

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