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US4929389A Expired / Lapsed US ⏱️ 0.0 years remaining

Water-soluble conductive polymers

Assignee: United States Department of Energy
•
Filing: 1988-02-12
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Granted: 1990-05-29
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Expires: 2008-02-12
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Abstract

Abstract Polymers which are soluble in water and are electrically conductive. The monomer repeat unit is a thiophene or pyrrole molecule having an alkyl group substituted for the hydrogen atom located in the beta position of the thiophene or pyrrole ring and having a surfactant molecule at the end of the alkyl chain. Polymers of this class having 8 or more carbon atoms in the alkyl chain exhibit liquid crystalline behavior, resulting in high electrical anisotropy. The monomer-to-monomer bonds are located between the carbon atoms which are adjacent to the sulfur or nitrogen atoms. The number of carbon atoms in the alkyl group may vary from 1 to 20 carbon atoms. The surfactant molecule consists of a sulfonate group, or a sulfate group, or a carboxylate group, and hydrogen or an alkali metal. Negative ions from a supporting electrolyte which may be used in the electrochemical synthesis of a polymer may be incorporated into the polymer during the synthesis and serve as a dopant to increase the conductivity.

Inventors

  • 👤 Mahmoud Aldissi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 15:22
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/127; C; C08; C08G; C08G61/00; C08G61/12; C08G61/122; C08G61/123

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 94 words
An electrically conductive self-doped polymeric composition of matter having a monomer repeat unit comprising: ##STR2## where the monomer-to-monomer bonds of said polymer are located between the carbon atoms adjacent to X; where X is chosen from a group consistng of NH and S; where m is a whole number having a value of from 1 to 20, inclusive; where Y is chosen from a group consisting of SO 3 , SO 4 , and CO 2 ; and where A is chosen from a group consisting of hydrogen, lithium, sodium, potassium, rubidium, and cesium.
Claim 2
Dependent Claim 94 words
An electrically conductive self-doped polymeric composition of matter having a monomer repeat unit comprising: ##STR2## where the monomer-to-monomer bonds of said polymer are located between the carbon atoms adjacent to X; where X is chosen from a group consistng of NH and S; where m is a whole number having a value of from 1 to 20, inclusive; where Y is chosen from a group consisting of SO 3 , SO 4 , and CO 2 ; and where A is chosen from a group consisting of hydrogen, lithium, sodium, potassium, rubidium, and cesium.
Claim 3
Dependent Claim 19 words
A composition of claim 1 having a molecular weight in the range of from about 20,000 to about 70,000.
Claim 4
Dependent Claim 10 words
A composition of claim 1 which is soluble in water.
Claim 5
Dependent Claim 25 words
A composition of claim 1 having a conductivity in the range of from about 10 -3 to about 10 5 ohm -1 cm -1 .
Claim 6
Dependent Claim 29 words
A composition of claim 1 containing an additional dopant to increase conductivity comprised of negative ions which are supplied from a supporting electrolyte substance utilized in synthesizing said composition.
Claim 7
Dependent Claim 32 words
A composition of claim 5 where said supporting electrolyte substance is chosen from a group comprised of tetraethylammonium para-toluenesulfonate, lithium perchlorate, tetrabutylammonium tetrafluoborate, lithium hexafluophosphate, lithium tetrafluorborate, lithium hexafluoarsenate, and tetrabutylammonium para-toluenesulfonate.
Claim 8
Dependent Claim 40 words
A composition of claim 1 having liquid crystalline properties, where X is sulfur, m has a value of 8 or 10, Y is an SO 3 group, and A is chosen from a group consisting of hydrogen, sodium, and potassium.
Claim 9
Dependent Claim 53 words
A composition of claim 7 having an electrical anisotropy of about 1000, the conductivity of the composition being about 10,000 ohm -1 cm -1 in a direction parallel to the orientation direction of the composition and about 10 ohm -1 cm -1 in a direction perpendicular to the orientation direction of the composition.
Claim 10
Dependent Claim 20 words
A composition of claim 1 which is additionally doped to increase conductivity by exposure to sulfuric acid or arsenic pentafluoride.

References Cited (Backward Citations)

US4691005A Cited
US4711742A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-05-28 1993-11-27 1994-05-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-05-28 1997-11-27 1998-05-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-05-28 2001-11-27 2002-05-29 $7700.00 Window Closed / Lapsed

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