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Novel Enzymatically Synthesized Substituted Polyaniline with High Conjugation and Conductivity

Published online by Cambridge University Press:  05 March 2018

Ferdinando F. Bruno*
Affiliation:
US Army Natick Soldier Research Development and Engineering Center, RDECOM, Natick, MA01760, United States.
Ramaswamy Nagarajan
Affiliation:
Department of Plastics Engineering and Center for Advanced Materials, University of Massachusetts, Lowell, Lowell, MA01854
Weeradech Kiratitanavit
Affiliation:
Department of Plastics Engineering and Center for Advanced Materials, University of Massachusetts, Lowell, Lowell, MA01854
Nicole Favreau-Farhadi
Affiliation:
US Army Natick Soldier Research Development and Engineering Center, RDECOM, Natick, MA01760, United States.
Bora Yoon
Affiliation:
US Army Natick Soldier Research Development and Engineering Center, RDECOM, Natick, MA01760, United States.
Stephen Fossey
Affiliation:
US Army Natick Soldier Research Development and Engineering Center, RDECOM, Natick, MA01760, United States.
Manuele Bernabei
Affiliation:
ITAF, Test Flight Centre, Chemistry Dept. Pratica di Mare AFB, 00071Pomezia (Rome), Italy (UE).
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Abstract

An efficient enzymatic route for the synthesis of conducting oligomer of substituted aniline complexed with poly(sodium 4-styrenesulfonate) is presented. This polyelectrolyte assisted horseradish peroxidase catalyzed oligomerization of ortho-toluidine provides a route to synthesize water-soluble, highly conductive oligomers under acidic conditions. The UV-Vis, FTIR, thin film conductivity, molecular weight assessment and modeling studies of the oligomer/polymer complex indicate the presence of a thermally stable and electroactive oligomer with extended conjugation that was not present in similar conductive polymers (e.g. PANI). Moreover, the use of water-soluble templates provide a unique combination of properties such as high conductivity and processability. The same procedure was also implemented for the polymerization of 2,6-xylidine: however, the reaction did not occur suggesting a much more complex stereo-specificity of the enzymatic polymerization. Modeling studies were used to explain this behavior. The conductive poly(ortho-toluidine) can be used in chemiresistive sensors for the detection of humidity.

Type
Articles
Copyright
Copyright © Materials Research Society 2018 

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References

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