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US5334668A Expired / Lapsed US ⏱️ 0.0 years remaining

Precursor polyphenylene for and method of producing glassy carbon

Assignee: University of South Carolina
•
Filing: 1993-02-04
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Granted: 1994-08-02
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Expires: 2013-02-04
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Abstract

Abstract Polymeric carbon can be formed by a method comprising the steps of (a) polymerizing 1-bromo-4-lithiobenzene to form a brominated polyphenylene wherein the ratio of brominated to non-brominated residues in the polymer is 1:5 or greater; (b) functionalizing the brominated polyphenylene to replace the bromide groups with a substituted or unsubstituted acetylene group; and (c) heating the functionalized polymer to a temperature of 900 DEG C. to form polymeric carbon. Preferably, the brominated polyphenylene is formed in an ethereal solvent such as tetrahydrofuran and then functionalized using a palladium catalyst and a copper catalyst. When the acetylene substituent is phenylacetylene, the product of the method is glassy carbon.

Inventors

  • 👤 James M. Tour
  • 👤 Eric Stephens
  • 👤 Joanna F. Davis

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 21:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; C08; C08G; C08G2261/00; C08G2261/30; C08G2261/31; C08G2261/312

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 65 words
A polymeric material having the formula ##STR3## wherein R is selected from the group consisting of hydrogen, trialkyl silyl groups, substituted and unsubstituted phenyl groups and n-alkyl groups and the ratio of n/m is 5 or less, and wherein the polymeric material has a level of meta linkages such that heating the polymer to 900° C. in a nitrogen atmosphere yields a glassy carbon material.
Claim 2
Dependent Claim 65 words
A polymeric material having the formula ##STR3## wherein R is selected from the group consisting of hydrogen, trialkyl silyl groups, substituted and unsubstituted phenyl groups and n-alkyl groups and the ratio of n/m is 5 or less, and wherein the polymeric material has a level of meta linkages such that heating the polymer to 900° C. in a nitrogen atmosphere yields a glassy carbon material.
Claim 3
Dependent Claim 11 words
A polymeric material according to claim 1, wherein R is phenylacetylene.
Claim 4
Dependent Claim 16 words
A polymeric material according to claim 1, wherein the ration of n/m is 2 or less.

References Cited (Backward Citations)

FR2147614A5 Cited
US4097460A Cited
US4070333A Cited
US4576688A Cited
US5169929A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1997-08-01 1998-01-31 1998-08-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2001-08-01 2002-01-31 2002-08-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2005-08-01 2006-01-31 2006-08-02 $7700.00 Window Closed / Lapsed

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