Characteristics of Degradation and Improvement of Properties with Conducting Polypyrrole

전도성 Polypyrrole의 분해 특성과 물성 개선

  • 이홍기 (전주 우석대학교 화학과) ;
  • 엄정호 (삼성전자 가전연구소) ;
  • 박수길 (충북대학교 공업화학과) ;
  • 심미자 (서울시립대학교 생명과학과) ;
  • 김상욱 (서울시립대학교 화학공학과) ;
  • 이주성 (한양대학교 공업화학과)
  • Received : 1994.01.13
  • Accepted : 1994.07.20
  • Published : 1994.10.01

Abstract

Electrochemical synthesis of conductive polypyrrole films was carried out in nucleophilic solvent containing p-toluenesulfonic acid or bezensulfonic acid as supporting electrolyte and dopant. Also characteristics of degradation and improvement of mechanical properties were studied. The conductivity, tensile strength and elongation of the films obtained in dimethyformamide/p-toluenesulfonic acid had the highest value of 10-40S/cm, $25N/mm^2$ and 10%, respectively. The optimum condition of electrochemical synthesis was $2mA/cm^2$ for constant current method and 0.9V for constant potential method containing 0.5M pyrrole and 0.5M p-TSA. The obtained films showed good stability in air and electrode characteristics of secondary battery by reversibility in doping and undoping. The degradation process was 1st order reaction at various temeprature. The activation energy and rate constant of degradation reaction were $1.01JK^{-1}mol^{-1}$ and $3.1{\times}10^{-7}min^{-1}$ respectively at $25^{\circ}C$. For the improvement of mechanical properties, composition of polypyrrole films with various host polymer were investigated and increase of tensile strength and elongation was confirmed.

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