Method for enhancing polyaniline conductivity
AssigneeMilliken Research Corporation
InventorCarey N. Barry, Jr.
Life of this patent
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Abstract
A process for heat treating substituted and/or unsubstituted polyaniline which has been doped with a relatively non-volatile acid is provided. Subjecting polyaniline to temperatures of between 70.degree. C. and 200.degree. C. for a moderate amount of time dramatically lowers the resistance, and therefore increase the conductivity, of the polyaniline. Heat treatment of polyaniline may be advantageously combined with a subsequent rinsing step to produce a sample which has superior stability and good conductivity.
Claims24
A method of treating polyaniline, wherein said polyaniline is a polymer of monomer units selected from aniline, o- and m- methoxyaniline, o- and m- ethoxyaniline, o- and m- toluidine, o- and m- chloroaniline, comprising the steps of:
- doping said polyaniline with a non-volatile acid, said polyaniline having an initial resistance, heating said polyaniline to a temperature above 70.degree. C. for a period of time sufficient to lower its resistance by at least 25% of said initial resistance, and cooling said polyaniline to ambient temperature while its resistance at a level which is at least 25% of said initial resistance.
A method of treating polyaniline, wherein said polyaniline is a polymer of monomer units selected from aniline, o- and m- methoxyaniline, o- and m- ethoxyaniline, o- and m- toluidine, o- and m- chloroaniline, wherein said monomer units are chemically oxidized in a reaction solution to form said polymer, said treatment comprising the steps of:
- doping said polyaniline with a non-volatile acid, said polyaniline having an initial resistance, and heating said polyaniline while removed from said reaction solution to a temperature of from 70.degree. C. to 200.degree. C. for a period of time sufficient to lower its resistance by at least 25% of said initial resistance, and cooling said polyaniline to ambient temperature while its resistance is at a level which is at least 25% of said initial resistance.
Dependencies are inferred from the claim text.