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Vicrostructure and Electrical Properties of Kevlar/Polypyrrole Composite Fibers

Published online by Cambridge University Press:  21 February 2011

L. P. Rector ,
D. DeGroot ,
T. J. Marks  and
S. H. Carr
L. P. Rector
Affiliation:
Northwestern University, Department of Materials Science and Engineering, 2145 Sheridan Road, Evanston, Il 60208.
D. DeGroot
Affiliation:
Northwestern University, Department of Electrical Engineering and Computer Science, 2145 Sheridan Road, Evanston, Il 60208.
T. J. Marks
Affiliation:
Northwestern University, Department of Materials Science and Engineering, 2145 Sheridan Road, Evanston, Il 60208. Northwestern University, Department of Chemistry, 2145 Sheridan Road, Evanston, Il 60208. Northwestern University, Materials Research Center, 2145 Sheridan Road, Evanston, Il 60208.
S. H. Carr
Affiliation:
Northwestern University, Department of Materials Science and Engineering, 2145 Sheridan Road, Evanston, Il 60208. Northwestern University, Materials Research Center, 2145 Sheridan Road, Evanston, Il 60208.
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Abstract

Electrically conducting composite polypyrrole/poly(p-phenyleneterephthalamide) (PPTA or KEVLAR) fibers have been prepared by chemical polymerization of pyrrole within the interstices of the hydrogen-bonded gel structure of never-dried PPTA fibers. The resultant fibers contain a uniform dispersion of polypyrrole, as evidenced by scanning electron microscopy. The temperature dependence of the electrical conductivity of these hybrid fibers is presented. The conductivity is well described by the fluctuation-induced charge transport model over the entire temperature range of interest. However, the low temperature electrical conductivity also exhibits a hoppinglike temperature dependence, and an Arrhenius-like temperature dependence is observed in the high temperature limit. Measurements of the temperaturedependent tbermopower are indicative of a p-type carrier.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 175: Symposium S – Multifunctional Materials , 1989 , 331
Copyright
Copyright © Materials Research Society 1990

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