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Adsorption of silane coupling agent on Co-γ-Fe2O3 a nd its effect on dispersibility

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Abstract

The adsorption of a new type of silane coupling agent containing polyethylene oxide (EOS) on cobalt-modified iron oxide (Co-γ-Fe2O3) particles and its effect on dispersibility are examined by measuring the surface chemical properties. The EOS is adsorbed on Co-γ-Fe2O3 in the form of a monolayer and reduces the hydrophilicity of the surface of the particles with the adsorption. The surface hydrophilicity of EOS-treated iron foil (the iron foil has an ideal iron oxide surface) becomes lower with the increasing heat-treatment temperature. Heat treatment at 80°C or higher is required to achieve chemical bonding between EOS and the iron foil. By the same heat treatment, EOS polymerizes on the iron foil resulting in the formation of a polysiloxane network. The dispersibility of the particles in vinyl chloride-vinyl acetate-vinyl alcohol copolymer solution is improved dramatically by the surface treatment with EOS. The improvement in dispersibility is explained by considering the increase of the wettability of Co-γ-Fe2O3 for the solvent due to EOS treatment.[/p]

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Authors and Affiliations

  1. Hitachi Maxell Ltd, Oyamazaki, Otokuni, Kyoto, 618, Japan

    Shigeo Aoyama, Kenji Sumiya & Masahiro Amemiya

Authors
  1. Shigeo Aoyama
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  2. Kenji Sumiya
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  3. Masahiro Amemiya
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Aoyama, S., Sumiya, K. & Amemiya, M. Adsorption of silane coupling agent on Co-γ-Fe2O3 a nd its effect on dispersibility. J Mater Sci 23, 1729–1734 (1988). https://doi.org/10.1007/BF01115713

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  • DOI: https://doi.org/10.1007/BF01115713

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