Synthesis of free-standing poly(3,4-ethylenedioxythiophene) conducting polymer films on a pilot scale

被引:44
作者
Yamato, H
Kai, K
Ohwa, M
Asakura, T
Koshiba, T
Wernet, W
机构
[1] International Research Laboratories, Ciba-Geigy (Japan) Ltd., Takarazuka, Hyogo 665
关键词
poly(3,4-ethylenedioxythiophene); polyanion; mechanical properties; continuous synthesis;
D O I
10.1016/S0379-6779(97)80065-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Electrochemical polymerization of 3,4-ethylenedioxythiophene (EDT) was carried out in the presence of monomeric anions or polyanions in electrolyte solutions. While no free-standing films of poly(3,4-ethylenedioxythiophene) (PEDT) were obtained using monomeric anions as dopants, flexible conducting polymers were obtained using novel polyanions, e.g., sulfated poly(beta-hydroxyethers) (S-PHE), sulfated poly(beta-hydroxyethers) having trifluoromethyl groups (S-PHEF), and sulfated polybutadiene (S-PBD). The conductivity of these PEDT/polyanion composites exceeded 150 S/cm, and reached as high as 400 S/cm when S-PHEF was used as dopant. These conducting composites demonstrated superior mechanical properties, and PEDT/S-PBD showed an elongation of 78-110% at 100 degrees C. The electrical properties were strongly dependent on the synthesis conditions. The important parameters were optimized for the S-PHE polyanion. By doing this the conductivity of the PEDT/S-PHE composite reached values around 230 S/cm. Based on the optimized parameters, a continuous synthesis of PEDT/S-PHE composite was developed leading to reproducible conducting composites. The electrode is cylindrical and 10 cm wide. The computer-controlled system enabled the preparation of PEDT films more than 20 m long.
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页码:125 / 130
页数:6
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