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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 29, 2006
Accepted June 20, 2006

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Electrically conductive composites prepared from 3-methyl thiophene by the FeCl3 oxidation method

Eun-Kyoung Lee^† Sei-Young Choi

Department of Applied Chemistry, Cheongju University, Cheongju 360-764, Korea

eklee@cju.ac.kr

Korean Journal of Chemical Engineering, November 2006, 23(6), 1055-1062(8), 10.1007/s11814-006-0029-8

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Abstract

Surface conductive polyurethane films from poly(propylene glycol), toluene 2,4-diisocyanate, 3-methyl thiophene and butyltin dilaurate can be successfully prepared by the diffusion-oxidative polymerization method. Various effects of the doping conditions, such as the reaction time, the FeCl3 concentration, the weight ratio of the 3-methyl thiophene to PU and the temperature on the electrical conductivity and thickness of the conductive layer of the 3-methyl thiophene/PU composite were investigated. Decomposition temperature rises gradually from pure undoped PU to doped composite that indicates blending took place in FeCl3/ethyl acetate solution. As oxidative reaction time increases, the electrical conductivity of the 3-methyl thiophene doped PU film increases together with the thickness of the coating layer. With increasing FeCl3 concentration and weight ratio of the 3-methyl thiophene to PU, the thickness of the coating layer decreases, while the electrical conductivity increases. The increase of the thickness of the PU film leads to the rise of the electrical conductivity. The thickness of the coating layer decreases, while the electrical conductivity of the 3- MT doped PU film increases with increasing reaction temperature. As the reaction time and temperature increase, the polar components of the PU film increase resulting into the increase of moisture regain value.

Keywords

Polymer Composite Organic Solution Diffusion-oxidative Reaction Electrical Conductivity

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