Electrically conductive polymer blend

Details Electrically conductive polymer blend Electrically conductive polymer blend

1985-10-07

1986-10-14

Lieberman, Allan M.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525203, 525279, 525455, 525452, 525186, 525375, C08L 2706, C08L 6500, C08L 7504

Patent

active

046173536

ABSTRACT:
A chemical process is provided for forming an electrically conductive polymer blend in which polypyrrole is a minor component. The polypyrrole is formed from a pyrrole monomer, optionally substituted at the 3- and 4-positions. The process comprises forming a solution of a matrix polymer in an anhydrous liquid reaction medium, and, in situ, contacting pyrrole monomer with a polymerization initiator selected from the group consisting of anhydrous halides of iron, cobalt or nickel (Group VIII metal) at a temperature in the range from about -20.degree. C. to below about the boiling point of the solution, so as to form the polypyrrole in situ. The polypyrrole so formed contains a Group VIII metal halide counterion dispersed within the matrix polymer so as to produce a conductive polyblend 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 abut 1 S/cm, depending upon the particular structures of the matrix polymer and the pyrrole monomer, the ratio of the initiator to pyrrole monomer, the order of addition of pyrrole monomer and initiator, and the molecular weight of the polypyrrole formed. The matrix polymer may be substituted with a polyblend which may contain two or more miscible or partially miscible polymers. The conductive polyblend formed retains such thermoformability of the matrix polymer as it had before it was made conductive by the in situ polymerization of the pyrrole monomer.

REFERENCES:
patent: 4468291 (1984-08-01), Naarmann et al.
De Paoli et al, J. Chem. Soc., Chem. Commun., 1984, pp. 1015 and 1016.
Niwa et al, J. Chem. Soc., Chem. Commun., 1984, pp. 817 and 818.
Furukawa, American Metal Market/Metalworking News, May 28, 1984, p. 8.
Myers, "Chemical Oxidative Polymerization as a Synthetic Route to Electrically Conductive Polypyrroles", B. F. Goodrich Goodrich, Jul. 9, 1985.

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