Microstructure and charge transport in hybrid metallophthalocyanine/rigid rod polymer fibers

J. M.C. Redman*, J. M. Giesler, W. R. Romanko, S. H. Carr, P. A. Depra, T. J. Marks, H. O. Marcy, C. R. Kannewurf

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Strong, environmentally stable, electrically conductive fibers can be fabricated from solutions of nickel phthalocyanine (Ni(Pc)) and the ultra-high modulus polymers poly-(p-phenyleneterephthalamide) (PPTA, Kevlar) or poly-p-phenylenebenzobisthiazole) (PBT) by dry-jet, wet-spinning techniques, followed by chemical or electrochemical doping. The fiber mechanical strength s at a particular composition is a simple linear function of the Ni(Pc) I volume fraction Φc : s ≈ sp (1-Φc), where sp is the of a pure PPTA or PBT fiber. The electrical conductivity σ for Φc>0.17 obeys the empirical relationship: 1n(σ) = Φc1n(σc) + (1 - Φc) 1n(σp) where σc represents the conductivity of polycrystalline Ni(Pc)I and σp denotes the conductivity of pure PPTA or PBT. The temperature dependence of σ is thermally-activated and can be fit to a fluctuation-induced carrier tunnelling model. In contrast, the thermoelectric power S of the fibers is p-type and metal-like (S ∼ T), strongly resembling that of Ni(Pc) I single crystals. X-ray diffraction shows microstructural evidence for phase separation and the presence of a fine (domain size <50 nm) Ni(Pc) I dispersion embedded in the PPTA or PBT matrix.

Original languageEnglish (US)
Pages (from-to)25-30
Number of pages6
JournalSynthetic Metals
Issue number2-3
StatePublished - Mar 21 1989

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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