Diffusion and Adsorption of a Model Cationic Dye, <I>m</I>-Nitrobenzylamine, in Polyacrylonitrile
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概要
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A model cationic dye, <I>m</I>-nitrobenzylamine (NBA), was synthesized, and the diffusion and adsorption behavior in polyacrylonitrile was investigated by the cylindrical film roll method. p<I>K</I><SUB>a</SUB> of NBA was determined spectroscopically to be 9.2 at 25 °C. The diffusion was concentration dependent and was described by the chemical potential gradient model. The temperature dependence of the diffusion coefficients above T<SUB>g</SUB>, which was found to be 65 °C from the inflection point of Arrhenius plot, could be described by WLF equation, where C<SUB>1</SUB><SUP>g</SUP> and C<SUB>2</SUB><SUP>g</SUP> are 1.64 and 17.09 (deg.) at pH 4.2, and 2.41 and 33.11 (deg.) at pH 6.8, respectively. Adsorption isotherm of NBA was obtained at 95 °C and pH 1.5, 4.2 and 6.8. The adsorption of NBA, bis(<I>m</I>-nitrobenzyl)amine and Malachite Green at pH 4.2 and those of NBA and bis(<I>m</I>-nitrobenzyl)amine at pH 6.8 were more or less the same. It is concluded that the adsorption of cationic compounds on polyacrylonitrile is virtually dependent upon the ion exchange mechanism. But the presence of sodium chloride in the dye bath did not change the adsorption of NBA at pH 4.2 and 95 °C. The surface concentration of NBA was gradually increased with rise of temperature at pH 1.5, 4.2 and 6.8.
- 公益社団法人 日本化学会の論文
著者
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Morita Zenzo
Department of Polymer Science, Faculty of Engineering, Tokyo Institute of Technology
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Hossain T.
Department of Polymer Science, Faculty of Engineering, Tokyo Institute of Technology
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Iijima Toshiro
Department of Polymer Science, Faculty of Engineering, Tokyo Institute of Technology
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