Electrically conductive pyrrole polymers

Details Electrically conductive pyrrole polymers Electrically conductive pyrrole polymers

1985-08-02

1988-08-16

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526258, 252519, C08F 406, C08F 440

Patent

active

047645733

ABSTRACT:
A process is provided for forming an electrically conductive polymer of a pyrrole monomer, optionally substituted at the 3- and 4- positions. The process comprises dispersing a polymerization initiator selected from the group consisting of anhydrous halides of iron, cobalt or nickel (Group VIII metal) in an anhydrous liquid reaction medium and, adding essentially pure pyrrole monomer, or a solution of the monomer in the liquid at a temperature in the range from about -20.degree. C. to below about the boiling point of the solution. The pyrrole polymer so formed is a Group VIII metal halide counterion, and a conductor having a conductivity in the range from about 1 to about 150 ohm.sup.-1 cm.sup.-1 ("S/cm" for brevity), or a semiconductor having a conductivity in the range from about 10.sup.-3 to about 1 S/cm, depending upon the particular structure of the monomer, the ratio of the initiator to pyrrole monomer, and the molecular weight of the polymer formed. Ratios greater than 4 generally yield conductors, while ratios in the range from about 0.25 to 4 yield semiconductors. Conductive polypyrrole having only a chloride or bromide counterion is formed in acetonitrile. The chemical process of this invention may be used to form the pyrrole polymer on a substrate such as paper by soaking it in liquid pyrrole, then dipping the pyrrole-impregnated paper into a solution of anhydrous ferric chloride in diethyl ether.

REFERENCES:
patent: 4401545 (1983-08-01), Noormann et al.
patent: 4468291 (1984-08-01), Noormann et al.
Robert B. Bjorklund et al., Journal of Electronic Materials, vol. 13, No. 1 (1984)--"Some Properties of Polypyrrole--Paper Composites" pp. 211-230.

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