Abstract
Effect of acidic catalysis having carboxylic acid group was studied on properties of conductive copolymer films made of pyrrole (Py) and 2-formyl pyrrole (FPy). It was noted that trifluoroacetic acid (TFA) and trichloroacetic acid (TCA) were suitable for the preparation of copolymer films, which showed good properties in its strength and electrical conductivity of the copolymer films. When the concentration of TFA or TCA was increased in the monomer feed, the copolymerization yield became higher and the obtained films showed electrical conductivity in the range of 10–4 - 10–3 S/cm. FT-IR and UV-Vis spectra confirmed the formation of conjugate chemical structure in the copolymer film.
Highlights
Conductive polymers with conjugated double bonds have been attracting in much attention of advanced materials
It was noted that trifluoroacetic acid (TFA) and trichloroacetic acid (TCA) were suitable for the preparation of copolymer films, which showed good properties in its strength and electrical conductivity of the copolymer films
In order to examine effect of catalyst on Py-formyl pyrrole (FPy) copolymer films, five species of carboxylic acids were used for the copolymerization
Summary
Conductive polymers with conjugated double bonds have been attracting in much attention of advanced materials. Chemical polymerization method could prepare a large quantity of PPy, it was known the resultant polymer was limited to powder shape [15,16,17] In these cases, generally, acidic catalyst was used in such chemical polymerization of pyrrole to solve this problem. Salmon and coworkers reported chemical polymerization of pyrrole for forming PPy films in the presence of sulfuric acid in ethanol [18] They mentioned that the films were fragile and unstable in their polymer properties. There is possibility for preparation of novel conductive copolymer films by using pyrrole (Py) and 2-formyl pyrrole (FPy) This type of Py-FPy components could expect to construct conjugated structure between Py and Fpy showing methine group (Scheme 1).
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