Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis and Properties of Ionic Polyacetylene Composite from the In-situ Quaternization Polymerization of 2-Ethynylpyridine Using Iron (III) Chloride

염화 철(III)을 이용한 2-에티닐피리딘의 in-situ4차염화중합을 통한 이온형 폴리아세틸렌 복합체의 합성과 특성

  • Taehyoung Kim (Department of Chemistry, University of Minnesota) ;
  • Sung-Ho Jin (Department of Chemistry Education, Pusan National University) ;
  • Jongwook Park (Department of Chemical Engineering, Kyung Hee University) ;
  • Yeong-Soon Gal (Department of Fire Safety, Kyungil University)
  • 김태형 (미네소타대 화학과) ;
  • 진성호 (부산대학교 화학교육학과) ;
  • 박종욱 (경희대학교 화학공학과) ;
  • 제갈영순 (경일대학교 소방방재학과)
  • Received : 2024.06.07
  • Accepted : 2024.06.18
  • Published : 2024.08.10
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Abstract

An ionic conjugated polymer-iron (III) chloride composite was prepared via in-situ quaternization polymerization of 2-ethynylpyridine (2EP) using iron (III) chloride. Various instrumental methods revealed that the chemical structure of the resulting conjugated polymer (P2EP)-iron (III) chloride composite has the conjugated backbone system having the designed pyridinium ferric chloride complexes. The polymerization mechanism was assumed to be that the activated triple bond of 2-ethynylpyridinium salt, formed at the first reaction step, is easily susceptible to the step-wise polymerization, followed by the same propagation step that contains the propagating macroanion and monomeric 2-ethynylpyridinium salts. The electro-optical and electrochemical properties of the P2EP-FeCl3 composite were studied. In the UV-visible spectra of P2EP-FeCl3 composite, the absorption maximum values were 480 nm and 533 nm, and the PL maximum value was 598 nm. The cyclic voltammograms of the P2EP-FeCl3 composite exhibited irreversible electrochemical behavior between the oxidation and reduction peaks. The kinetics of the redox process of composites were found to be very close to a diffusion-controlled process from the plot of the oxidation current density versus the scan rate.

염화 철(III)을 이용한 2-에티닐피리딘의 in-situ 4차염화 중합을 통하여 이온성 폴리아세틸렌-염화 철(III) 복합체를 용이하게 합성하였다. 합성한 폴리아세틸렌-염화 철(III) 복합체의 구조를 여러 가지 분석장비를 통해 확인한 결과 설계한 염화 철(III)-피리디늄 치환기를 갖는 공액구조 고분자가 생성되었음을 확인할 수 있었다. 본 중합의 메커니즘은 첫 번째 단계에서 형성된 에티닐피리디늄 염의 중합반응이 개시되고 전파되는 것으로 분석되었다. P2EP-FeCl3 복합체의 전기 광학 및 전기화학적 특성을 연구하였다. P2EP-FeCl3 복합체의 UV-visible 스펙트럼에서 흡수 최대값은 480 nm 및 533 nm이었고 PL 최대값은 598 nm로 나타났다. P2EP-FeCl3 복합체의 순환 전압전류 특성 측정결과 산화 피크와 환원 피크가 비가역적인 전기화학적 거동을 보였으며, 복합체의 산화 환원 과정의 동역학은 스캔 속도 대비 산화 전류 값의 도표부터 확산 제어 프로세스에 가까운 것으로 확인되었다.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant (RS-2023-00243822) of the Ministry of Science and ICT. This work was also supported by the research fund of Kyungil University. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A1A03048004).

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