Effect of the Functional Groups of the Matrix Polymer Chain-Ends in Conductive Polymer Composites.

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  • Wu Chifei
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology
  • ASAI Shigeo
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology
  • SUMITA Masao
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology
  • MIYASAKA Keizo
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology

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Other Title
  • 高分子複合導電材料におけるマトリックスポリマーの末端官能基の効果
  • コウブンシ フクゴウ ドウデン ザイリョウ ニ オケル マトリックス ポリマー

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Description

The electrical properties and the dispersion of particles of carbon black (CB) -filled polymeric composites can be affected by the chemical modification of the matrix polymer chain-ends. The present paper discusses this effect. We measured the electrical conductivity of composites as a function of carbon volume fraction and temperature, and observed the dispersion state of CB in matrix polymer by scanning electron microscopy (SEM). Chain-ends modified polystyrene (MPS) filled with CB has a larger percolation threshold than the non-modified. This is because the strong interaction between the cationic chain-ends and anionic CB surface contributes to regular distribution of CB particles in MPS matrix. Therefore, the improvement in the dispersion of particles depends on the amounts of oxygen-containing groups on the CB surface. Thus a composite material having well-dispersed state is obtainable by means of the chemical modification of the matrix polymer chain-ends and the oxidation treatment of the filler. In polyethylene (PE) / polystyrene (PS) blends, CB particles were located in the PE phase. When MPS are used, if filler content is less than the threshold, CB particless are located in the MPS phase; above this threshold CB particles can also exist in the PE phase.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 49 (11), 927-932, 1992

    The Society of Polymer Science, Japan

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