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    The Influence of Carbon Nanotubes on the Protective Properties of Polypyrrole Formed at Copper


    Carragher, Ursula and Branagan, David and Breslin, Carmel B. (2019) The Influence of Carbon Nanotubes on the Protective Properties of Polypyrrole Formed at Copper. Materials, 12 (16). p. 2587. ISSN 1996-1944

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    Abstract

    Protective polypyrrole films doped with dodecylbenzene sulfonate (DBS) were formed at copper, while carbon nanotubes (CNT) were incorporated within the polymer films with the DBS to give PPy-DBSCNT (polypyrrole films doped with DBS and incorporated CNT). The polymer films were deposited from a 0.05 M DBS solution at a pH of 6.0 at a thin polypyrrole film doped with tartrate, which served as a stable pre-layer. Low corrosion currents of 0.12 and 0.05 μA cm−2 were estimated using Tafel analysis for the PPy-DBS and PPy-DBSCNT films, respectively, while a significant reduction in the concentration of Cu2+ ions from the corroding copper was observed for the polymer-modified copper. The corrosion protection properties were attributed to the doping of the polymer by the large and immobile DBS anions and possibly, by the larger anionic micelles that are formed at a DBS concentration of 9.8 mM in the pyrrole-containing solution. These dopants give a negatively charged surface that repels chloride anions. The additional protective properties afforded by the CNTs appear to be related to the morphology of the CNT-modified polypyrrole coatings, while the functionalized CNTs also provide a negatively charged surface

    Item Type: Article
    Keywords: corrosion protection; polypyrrole; carbon nanotubes; dodecylbenzene sulfonate; copper;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 12510
    Identification Number: https://doi.org/10.3390/ma12162587
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 04 Mar 2020 15:16
    Journal or Publication Title: Materials
    Publisher: MDPI AG
    Refereed: Yes
    URI:

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