The interaction of pigment with polystyrene latex particles prepared using an amino-acid-type amphoteric emulsifier.

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概要

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• An emulsion polymerization of styrene in the presence of an amino-acid type amphoteric emulsifier (<I>N</I><SUP>ε</SUP>-lauroyl-<I>N</I><SUP>α</SUP>,<I>N</I><SUP>α</SUP>-dimethyllysine (DMLL)) was carried out at pH 7.0. The stability of mixed dispersions containing the latex particles prepared with DMLL and titanium dioxide (TiO<SUB>2</SUB>) was then discussed as a function of the pH in a mixed dispersed solution. The zeta-potential of the synthesized latex particles was significantly dependent on the pH and showed the existence of an isoelectric point (IEP) at pH 4.5. On the other hand, TiO<SUB>2</SUB> particles had their IEP at pH 8.5. Below pH 4.5 and above pH 8.5, the mixed dispersions of the synthesized latex particles and TiO<SUB>2</SUB> particles were well-dispersed because of their electric repulsion. In the range of pH 4.5–8.5, where the latices were negatively charged, while the TiO<SUB>2</SUB> were positively charged, at low concentrations of the latex particles the mixed suspension was dispersed, but with an increase in the number of latex they heterocoagulated and were then redispersed at high concentrations of the latex particles. The mechanisms of these processes are discussed.

• 公益社団法人 日本化学会の論文

著者

• Esumi Kunio

  Department Of Applied Chemistry And Institute Of Colloid And Interface Science Science University Of

• Meguro Kenjiro

  Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo

• Kanda Kouichiro

  Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo

• Kato Kazufumi

  Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo

• Kondo Harumi

  Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo

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