ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
A highly conductive poly(2,5-thiophenydily) film was obtained when thiophene was electrochemically polymerized at 5°C in nitrobenzene with Bu4NBF4 or Bu4NClO4 as a supporting electrolyte. A platinum plate or indium oxide glass was used as an electrode. The current efficiency was 62%. The IR, UV, and ESR spectra were compared with those of a poly(2,5-thiophenediyl) obtained from 2,5-dibromothiophene by polycondensation. The electrochemically prepared poly(2,5-thiophenediyl) was identified by its IR spectrum. In its UV spectrum, two bands are observed at 440 nm and 740 nm. The band at 740 nm disappears in an undoped film of poly(2,5-thiophenediyl), which resembles that of the polymer obtained by polycondensation. The ESR spectra were also measured for undoped and partly undoped films. The undoped film shows an asymmetrical signal, Whereas the signal of the polymer resulting from polycondensation is symmetrical. In the air the conductivity decreases by a factor of 10-2 of the initial value in about 70 days, but an undoped film is quite stable. The undoped film can be re-doped with iodine or sulfur trioxide and attains higher conductivity than the pellets of polymers obtained by polycondensation. This may be attributed to the difference in morphology.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1984.021850703
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