Synthesis, Characterization, and Properties of Sulfonated CNT‐Doped Poly(aniline‐co‐carbazole)‐PVA Conductive Films

• Published in: Macromolecular materials and engineering 2023-07, Vol.308 (7), p.n/a
• Main Authors: Lakouraj, Moslem M., Norouzian, Rafieh‐sadat, Tavakoli, Malihe
• Format: Article
• Language: English
• Subjects: Aniline; Carbazoles; Conducting polymers; conductive films; Contact angle; Copolymers; Corrosion currents; Corrosion potential; Corrosion prevention; Corrosion resistance; Current carriers; Cyclic loads; Dopants; Electrochemical analysis; flexible nanocomposites; Infrared analysis; Mechanical properties; Multi wall carbon nanotubes; Nanocomposites; Nanorods; poly(aniline‐co‐carbazole); Polymer films; Polyvinyl alcohol; sulfonated carbon nanotube dopants; Sulfonic acid; Tensile strength; Tensile tests; Thermal analysis
• ISSN: 1438-7492; 1439-2054
• DOI: 10.1002/mame.202200696

Conductive flexible films are successfully synthesized from polyvinyl alcohol matrix and poly(aniline‐co‐carbazole) charge carrier. To improve the mechanical properties of polyvinyl alcohol and promote charge transition in the conductive copolymer, dual purpose sulfonated multiwall carbon nanotube is added. Conductivity is enhanced via sulfonic acid protonic dopant and mechanical property is increased by its hexagonal nanorods. Nanocomposites are prepared by adding 0.025, 0.050, and 0.075 g of carbon nanotube which is added at 1%, 3%, and 5% loads to the polymer matrix. Films are characterized by infrared, UV–vis, X‐ray diffraction, scanning electron microscopy, and thermogravimetric analysis. Conductivity is measured by the four‐probe technique and mechanical property is assessed through tensile tests and dynamic mechanic thermal analysis. A 5 × 10−6 S cm−1 conductivity and 116 MPa tensile strength are recorded for the conductive film with optimum dopant/nanocomposite loads. The electrochemical property and corrosion resistance are studied by cyclic voltammetry and Tafel curves, respectively. The conductive films show an increase in corrosion potential and a decrease in corrosion current referring to a reliable corrosion protection film. The water uptake and contact angle of the films are measured to be 157% and 80.1° respectively to confirm its required hydrophilic property. This article introduces a hydrophilic conductive film consisting of polyvinyl alcohol as the matrix, polyaniline‐co‐carbazole copolymer as the intrinsically conductive polymer, to imply desired conductivity, and sulfonated carbon nanotube functionalized nanorod for its dual property, that is, dopant and reinforcing agent. The electrochemical and mechanical properties of this conductive film approve its potential use as a flexible anticorrosion coating.