Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis and Characterization of Polyaniline doped with Ionic Liquid

이온성 액체로 도핑된 폴리아닐린의 합성 및 특성

  • Hong, Jang-Hoo (Department of Fine Chemistry, Seoul National University of Technology) ;
  • Jo, Gyu Seong (Department of Fine Chemistry, Seoul National University of Technology)
  • 홍장후 (서울산업대학교 정밀화학과) ;
  • 조규성 (서울산업대학교 정밀화학과)
  • Received : 2009.11.02
  • Accepted : 2009.12.03
  • Published : 2010.02.10
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Abstract

Polyaniline doped with ionic liquid (1,3-dimethylimidazolium methylsulfate, I-DMS) soluble in polar solvents (NMP, DMSO, DMF, m-cresol etc.) were synthesized by nucleophilic addition. Solubilities of PAN/I-DMS powder in polar solvents were observed in the range of 3~6 wt%/vol., respectively. The electrical conductivities of PAN/I-DMS films appeared in the range of $10^{-2}{\sim}7S/cm$. Polyaniline doped with I-DMS (PAN/I-DMS) showed improved thermal stability and conductivity compared to that of HCl doped polyaniline (PAN/HCl) and dimethylsulfate (DMS) doped polyaniline (PAN/DMS) upon heat treatment at $160^{\circ}C$. These improved conductivity and solubility in organic polar solvents was explained with the interactions between the polar sulfonate group and polar solvents.

친핵성 첨가반응에 의한 극성 용매(NMP, DMSO, DMF, m-cresol etc.)에 용해성을 갖는 이온성 액체(1,3-dimethylimidazolium methylsulfate, I-DMS)로 도핑된 폴리아닐린(PAN/I-DMS)을 합성하였다. 극성 용매 내에서 PAN/I-DMS의 용해도는 3~6 wt%/vol.을 나타내었고, PAN/I-DMS films의 전기전도도는 $10^{-2}{\sim}7S/cm$를 나타내었다. PAN/I-DMS는 HCl로 도핑된 폴리아닐린(PAN/HCl)과 dimethylsulfate (DMS)로 도핑된 폴리아닐린(PAN/DMS)에 비하여 $160^{\circ}C$에서 열적 안정성과 전기 전도성이 우수함을 볼 수 있었다. 극성 용매 내에서의 용해도와 전기 전도도 증가 현상을 극성 sulfonate group과 극성 용매간의 상호 작용으로 설명하였다.

Keywords

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