X-Ray Photoelectron Spectroscopy Study of the Composition of Polyphenol Films Formed on Pt by Electropolymerisation of Phenol in the Presence of Sulphide in Carbonate Medium

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  • Lapuente Rocío
    Departamento de Ingeniería de la Construcción, O.P. e Inf. Urbana, Universidad de Alicante
  • Quijada César
    Departamento de Ingeniería Textil y Papelera, Escuela Politécnica Superior de Alcoy, Universidad Politécnica de Valencia
  • Huerta Francisco
    Departamento de Ingeniería Textil y Papelera, Escuela Politécnica Superior de Alcoy, Universidad Politécnica de Valencia
  • Cases Francisco
    Departamento de Ingeniería Textil y Papelera, Escuela Politécnica Superior de Alcoy, Universidad Politécnica de Valencia
  • Vázquez José L.
    Departamento de Química Física, Universidad de Alicante

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Abstract

The chemical composition and structure of polyphenol films formed electrochemically on Pt from bulk phenol in the absence and in the presence of solution sulphide were studied by XPS. The C1s (284.2–284.6 and 285.6–286 eV) and the O1s (533eV) signals are consistent with a polymeric structure consisting of an aromatic carbon ring backbone linked by ether-like bonds and with hydroxyl groups. This structure is common to all the examined films formed under either potentiodynamic or potentiostatic conditions, even though the coatings formed in the presence of sulphide seemed to possess a higher ether-like oxygen content. Polyphenol films generated by cyclic voltammetry in the presence of sulphide contained a small amount of incorporated sulphur, with a characteristic binding energy of 162.3eV which is essentially identical to that found for a sulphur layer deposited on Pt from sulphide in phenol-free solutions. The film is described as a S-polyphenol composite material, in which the S fraction is mainly incorporated at the early stages of filming. Sulphur-polyphenol composite coatings proved to possess more effective barrier properties than S-free polyphenol films.

Journal

  • Polymer Journal

    Polymer Journal 35 (12), 911-919, 2003

    The Society of Polymer Science, Japan

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