Electrically conductive pyrrole polymers
US4764573A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1985 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Aug 2, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G61/124
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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 pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.