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Method for preparing polyaniline fibers

Patent ·
OSTI ID:873259
 [1];  [2]
  1. Santa Fe, NM
  2. Los Alamos, NM
+ Show Author Affiliations

Stable, concentrated solutions of high molecular weight polyaniline. In order to process high quality fibers and other articles possessing good mechanical properties, it is known that solution concentrations of the chosen polymer should be in the range from 15-30% (w/w). Moreover, it is desirable to use the highest molecular weight consistent with the solubility properties of the polymer. However, such solutions are inherently unstable, forming gels before processing can be achieved. The present invention describes the addition gel inhibitors (GIs) to the polymer solution, thereby permitting high concentrations (>15% (w/w)) of high molecular weight ((M.sub.w)>120,000, and (M.sub.n)>30,000) emeraldine base (EB) polyaniline to be dissolved. Secondary amines have been used for this purpose in concentrations which are small compared to those which might otherwise be used in a cosolvent role therefor. The resulting solutions are useful for generating excellent fibers, films, coatings and other objects, since the solutions are stable for significant time periods, and the GIs are present in too small concentrations to cause polymer deterioration. It is demonstrated that the GIs found to be useful do not act as cosolvents, and that gelation times of the solutions are directly proportional to the concentration of GI. In particular, there is a preferred concentration of GI, which if exceeded causes structural and electrical conductivity degradation of resulting articles. Heating of the solutions significantly improves solubility.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM
DOE Contract Number:
W-7405-ENG-36
Assignee:
Regents of University of California (Los Alamos, NM)
Patent Number(s):
US 6123883
OSTI ID:
873259
Country of Publication:
United States
Language:
English

References (6)

Towards optimization of electrical and mechanical properties of polyaniline: Is crosslinking between chains the key? journal March 1993
Polyaniline: Dependency of selected properties on molecular weight journal March 1993
Improved solution stability and spinnability of concentrated polyaniline solutions using N,N′-dimethyl propylene urea as the spin bath solvent journal March 1995
Polyaniline spinning solutions and fibers journal June 1993
Polyaniline: Synthesis and Characterization of the Emeraldine Oxidation State by Elemental Analysis book January 1987
LiCl Induced Morphological Changes in Polyaniline Base and Their Effect on the Electronic Properties of the Doped Form journal January 1996

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Related Subjects

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000
120
15
15-30
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achieved
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emeraldine
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