Preparation of conductive polyaniline having controlled molecula

Details Preparation of conductive polyaniline having controlled molecula Preparation of conductive polyaniline having controlled molecula

1990-01-30

1991-04-16

Barr, Josephine

Compositions

Electrically conductive or emissive compositions

252518, 528422, 525540, H01B 106

Patent

active

050080415

ABSTRACT:
Process for producing conductive polyaniline of controlled molecular weight by providing a mixture of aniline and dianiline in predetermined proportions dependent on the desired molecular weight of polyaniline to be formed. The mixture is reacted in the presence of an oxidant such as ammonium persulfate and a protonic (Bronsted) acid such as tosylic acid, to polymerize the mixture of aniline and dianiline, and forming conductive polyaniline of the desired molecular weight. Soluble conductive polyanilines having an average molecular weight not higher than about 600,000 (by gel permeation chromatography versus polystyrene in N-methyl pyrrolidone) can be obtained. Using about 6 to about 18 mols of aniline per mol of dianiline, according to one mode of procedure, conductive polyaniline having an average molecular weight ranging from about 150,000 to about 600,000 can be obtained. According to another feature of the invention, mild or weak oxidants such as o-chloranil and cupric chloride, as well as strong oxidants such as ammonium persulfate, can be used in the reaction.

REFERENCES:
patent: 4498685 (1989-01-01), Yaniger
patent: 4806271 (1989-02-01), Yaniger et al.
patent: 4822638 (1989-04-01), Yaniger
patent: 4851487 (1989-07-01), Yaniger et al.
patent: 4855361 (1989-08-01), Yaniger et al.

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