Preparation and Characterization of Conducting Composites Impregnated with Thick Polyheterocyclic Polymers

전도성 복합소재의 합성과 특성연구

  • Park, Jun-Seo (Dept. of Chemical Engineering, An Sung National University)
  • 박준서 (안성산업대학교 화학공학과)
  • Received : 1997.11.22
  • Accepted : 1998.03.26
  • Published : 1998.06.10

Abstract

Light-weight conductive polymer composites were prepared by incorporating polyheterocycles such as polypyrrole and polythiophene into pores of a highly porous cross-linked polystyrene, host polymer, to form a conductive network. The highly hydrophobic and porous host polymer was synthesized by concentrated emulsion polymerization method. Polypyrrole-based composites, prepared by employing ferric chloride-methanol system, showed a conductivity as high as 0.82 S/cm. Conductivity of polythiophene-based composites, prepared from ferric chloride-acetonitrile system, was 6.05 S/cm. Conductivity of compositivity was influenced by the initial molar ratio of oxidant to monomer as well. SEM micrographs of the composites showed that conducting polymer coated uniformly the inside wall of the porous host polymer. Shielding effectiveness of the polypyrrole-based composites and of the polythiophene-based composites were 15.2 dB and 22.5 dB at 2.0 GHz, respectively. In the temperature range from 20 to 300K, a polypyrrole impregnated composite exhibited seimiconducting behavior and followed the variable range hopping(VRH) model for charge transport.

Keywords

Acknowledgement

Supported by : 학술진흥재단

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