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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6360

    Título
    Chromogenic Anticounterfeit and Security Papers: An Easy and Effective Approach
    Autor
    Guirado Moreno, José CarlosAutoridad UBU Orcid
    Guembe García, MartaAutoridad UBU Orcid
    García Pérez, José MiguelAutoridad UBU Orcid
    Aguado, Roberto
    Valente, Artur J. M.
    Vallejos Calzada, SaúlAutoridad UBU Orcid
    Publicado en
    ACS Applied Materials & Interfaces. 2021, v. 13, n. 50, p. 60454–60461
    Editorial
    American Chemical Society
    Fecha de publicación
    2021-12
    ISSN
    1944-8244
    DOI
    10.1021/acsami.1c19228
    Zusammenfassung
    The synthesis and preparation of 12 chromogenic polymers used to build an intelligent label for security paper applications are described. The process involves coating paper sheets with the polymers. Depending on the number of different polymers used in a combinatory way, a maximum of 1212 combinations is possible, thus creating a matrix that is practically impossible to counterfeit. Currently, most anticounterfeiting proposals for paper-based packaging and documents involve some sort of verification under ultraviolet radiation, and the requirement of additional equipment often relegates the end-user to a passive role. In contrast, in our approach, the combination of sensory polymers in an array gives rise to an invisible label, i.e., an owner cryptographic key, which becomes visible upon scattering a nitrite solution (e.g., spraying or using an impregnated foam roller) over the printed label on the security paper. For this purpose, a monomer containing an aromatic primary amino group and another with an activated aromatic ring are covalently bonded to a polymer with high affinity toward paper, consisting essentially of units of methyl methacrylate and 1-vinyl-2-pyrrolidone. Subsequently, the paper samples are coated with the resulting sensory chromogenic polymer. By spraying, painting, or staining an aqueous acid solution of NaNO2 (at least 1.20 g/L) and the chromogenic polymers, a well-defined color appears, because of the formation of an azo compound. This process provides users with a quick and facile authentication method without additional equipment and without affecting paper strength.
    Palabras clave
    Anticounterfeit
    Papers
    Azo-coupling
    Sensory polymers
    Colorimetry
    RGB parameters
    Materia
    Química orgánica
    Chemistry, Organic
    URI
    http://hdl.handle.net/10259/6360
    Versión del editor
    https://doi.org/10.1021/acsami.1c19228
    Aparece en las colecciones
    • Artículos POLYMERS
    • Artículos Química Orgánica
    Atribución 4.0 Internacional
    Documento(s) sujeto(s) a una licencia Creative Commons Atribución 4.0 Internacional
    Dateien zu dieser Ressource
    Nombre:
    Guirado-acsami_2021.pdf
    Tamaño:
    4.160Mb
    Formato:
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