Interpolymer complexes of polyaniline and ionic copolymers: A design of conductive polymers for applications

Huaibing Liu, University of Rhode Island

Abstract

A molecular design of organic polymeric optical and electronic materials with material stability, processability and flexibility in property adjustment has been developed. A series of electrically conductive interpolymer complexes of polyaniline and anionic copolymers have been first synthesized and characterized. In this complex, there are two components; one is polyaniline (PANI) and the other is an anionic copolymer. The polyaniline component is a vehicle to carry the electrical and optical properties; the ionic copolymer is used as a vehicle to optimize structural features that are needed for processability and durability.^ The ionic copolymers used include random copolymers poly (acrylamide-co-acrylic acid) (PAAm-PAA) with acrylic acid contents 90%, 70%, 40% and 10%, and alternating copolymers, i.e., poly(ethylene-co-maleic acid)(PE-MLA) and poly(vinyl methyl ether-co-maleic acid)(PVME-MLA). The synthesis of the complex involves a non-trivial template-guided polymerization.^ The physical properties, electronic spectra, vibrational spectra and compositional analysis support that ionic random copolymers form molecular complexes with polyaniline. The solubility is adjustable with the copolymers from being water soluble to being water insoluble but soluble in mixed solvents. It is strikingly remarkable that such a copolymer with even as low as 10% carboxylic groups still can form a molecular complex through template polymerization. The most advantage of PANI/PVME-MLA is that this complex may have aniline loading as high as An/-COOH = 4 and still remain a homogeneous dispersion in water. Thus a water borne coating system with good conductivity has been achieved. The applications which take advantage of the new polymeric complex of PANI/PVME-MLA have been preliminarily explored. It is significant that the conductive coatings and conductive fabrics with good conductivity have been achieved with the water borne complex.^ The hysteresis behavior during titration of several double stranded polyaniline/polyelectrolyte complexes has been studied. The effects of ionic strength on the hysteresis magnitude has been investigated. The apparent hysteresis is attributed to both electrostatic effects and conformational changes accompanying the process of protonation/deprotonation. ^

Subject Area

Chemistry, Polymer

Recommended Citation

Huaibing Liu, "Interpolymer complexes of polyaniline and ionic copolymers: A design of conductive polymers for applications" (1997). Dissertations and Master's Theses (Campus Access). Paper AAI9805243.
http://digitalcommons.uri.edu/dissertations/AAI9805243

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