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Determination of percolation threshold electroactivity and phase behavior study on conducting blends of thermotropic polyesters and polyaniline
Author(s) -
Bagheri Massoumeh,
Didehban Khadije,
Razmi Habib,
Entezami Ali Akbar
Publication year - 2004
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.532
Subject(s) - materials science , thermotropic crystal , polyaniline , differential scanning calorimetry , polyester , percolation threshold , cyclic voltammetry , conductive polymer , polymer chemistry , liquid crystal , chemical engineering , polymer blend , scanning electron microscope , phase (matter) , polymer , organic chemistry , composite material , electrochemistry , copolymer , chemistry , polymerization , electrical resistivity and conductivity , electrode , liquid crystalline , physics , optoelectronics , engineering , electrical engineering , thermodynamics
The new thermotropic polyester/polyaniline (PI n /PAni) blends have been prepared by solution blend of synthesized liquid crystalline poly[4,4′‐bis ( ω ‐alkoxy) biphenylisophthalate]s having four and six methylene units in spacer (PI4 and PI6) with PAni doped with camphorsolfonic acid (CSA). The percolation threshold electroactivity of prepared blend films has been determined by cyclic voltammetry. The effect of the PAni concentration, solvent nature and polyester structure on the electroactivity of the blends has been investigated. The extremely low percolation threshold of prepared PIn/PAni‐CSA blends from dimethylformamide (DMF) and m ‐cresol solution was 3% weight of PAni‐CSA. The amount of conducting polymer necessary to retard the formation of the liquid crystalline (LC) phase is up to 45% by weight. Phase behavior studies by differential scanning calorimetry and polarizing microscopy show that blends with 45% of conducting polymer are both liquid crystal and conductive. The morphology of the blends has been investigated by scanning electron microscopy. Copyright © 2004 John Wiley & Sons, Ltd.