Conformational defects in poly(3-alkylthiophene)s and their copolymers

Chen, Show‐An; Ni, Jui-Ming

doi:10.1016/0379-6779(93)90994-8

Cited by 7 publications

(1 citation statement)

References 5 publications

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“…The optical variations caused by conformational transitions were also observed in several another conducting polymers 29–33. Optical absorption changes led to the enhancements of the Raman bands related to the oxidized species caused by a resonance effect 18.…”

Section: Resultsmentioning

confidence: 78%

Raman spectroscopic studies on the structural changes of electrosynthesized polypyrrole films during heating and cooling processes

Feng-En

Zhang

Wang

et al. 2003

J of Applied Polymer Sci

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Polypyrrole films were electrochemically synthesized by direct oxidative polymerization of pyrrole in acetonitrile containing ␤-naphthalene sulfonic acid or tetrabutylammonium tetrafluoroborate as an supporting electrolyte. We characterized the as-grown polypyrrole films by resonance Raman spectroscopy in the temperature region of Ϫ195 to 275°C. During the heating process, the Raman bands related to the oxidized species decreased gradually, due mainly to the affect of oxygen and moisture in the air, and, finally, the neutral polymer chains decomposed into disordered carbons. During the cooling process, polymer chains changed from disordered (coil-like) to ordered (rodlike) structures and caused the elongation of the conjugated chain length. This results in a red shift of the absorption of the electron spectra of the polymer and the enhancements of the Raman bands related to the oxidized species.

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Section: Resultsmentioning

confidence: 78%

Raman spectroscopic studies on the structural changes of electrosynthesized polypyrrole films during heating and cooling processes

Feng-En

Zhang

Wang

et al. 2003

J of Applied Polymer Sci

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show abstract

Electronic Excited States of Conjugated Oligothiophenes

Taliani¹,

Gebauer²

1998

Handbook of Oligo‐ and Polythiophenes

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Anomalies in the temperature dependence of the electrical conductivity of polypyrrole

Skákalová

Fedorko

Płocharski

1994

Macro Chemistry & Physics

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Anomalies in the temperature dependence of the conductivity of BF; doped polypyrrole were observed in cyclic measurements at temperatures between 250 K and 310 K. The anomalies were accompanied by endothermic effects in differential scanning calorimetry and are interpreted as being due to conformational changes (creation and disappearance of conformational defects) in the polymer chains. The conformational defects are supposed to influence the energy and the concentration of bipolarons and, consequently, the transport in the polymer.

show abstract

Conformational defects in poly(3-alkylthiophene)s and their copolymers

Cited by 7 publications

References 5 publications

Raman spectroscopic studies on the structural changes of electrosynthesized polypyrrole films during heating and cooling processes

Raman spectroscopic studies on the structural changes of electrosynthesized polypyrrole films during heating and cooling processes

Electronic Excited States of Conjugated Oligothiophenes

Anomalies in the temperature dependence of the electrical conductivity of polypyrrole

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