Articles producció científica> Química Analítica i Química Orgànica

Thermal curing of an epoxy-anhydride system modified with hyperbranched poly(ethylene imine)s with different terminal groups

  • Datos identificativos

    Identificador: PC:1438
    Autores:
    À. SerraJ.M. MoranchoX. Fernández-FrancosC. AceboX. RamisJ.M. Salla
    Resumen:
    New hyperbranched polymers (HBP) have been synthesized by reaction of a poly(ethylene imine) with phenyl and t-butyl isocyanates. These HBPs have been characterized by 1H-NMR (nuclear magnetic resonance of hydrogen) and Fourier transform infrared spectroscopy. Their influence on the curing and properties of epoxy-anhydride thermosets has been studied by different techniques: differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and thermogravimetry (TG). The curing kinetics has been studied with DSC. Integral isoconversional method and the Šesták–Berggren model have been used to determine the activation energy and the frequency factor. The kinetic parameters are very similar for all the studied systems at the middle stage of the process, but changes are observed at the beginning and at the end of the process when these modifiers are used. The HBPs reduce the glass transition temperature of the cured materials. In addition, from the DMA analysis it can be seen that the HBP modifier obtained from phenyl isocyanate hardly changes the storage modulus, but the obtained ones from t-butyl isocyanate decrease it. TG analysis reveals a decrease in the onset temperature of the degradation process upon addition of the HBPs.
  • Otros:

    Autor según el artículo: À. Serra; J.M. Morancho; X. Fernández-Francos; C. Acebo; X. Ramis; J.M. Salla
    Departamento: Química Analítica i Química Orgànica
    Autor/es de la URV: SERRA ALBET, MARIA ANGELS; J.M. Morancho; X. Fernández-Francos; C. Acebo; X. Ramis; J.M. Salla
    Palabras clave: Epoxy networks Kinetics hyperbranched polymers
    Resumen: New hyperbranched polymers (HBP) have been synthesized by reaction of a poly(ethylene imine) with phenyl and t-butyl isocyanates. These HBPs have been characterized by 1H-NMR (nuclear magnetic resonance of hydrogen) and Fourier transform infrared spectroscopy. Their influence on the curing and properties of epoxy-anhydride thermosets has been studied by different techniques: differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and thermogravimetry (TG). The curing kinetics has been studied with DSC. Integral isoconversional method and the Šesták–Berggren model have been used to determine the activation energy and the frequency factor. The kinetic parameters are very similar for all the studied systems at the middle stage of the process, but changes are observed at the beginning and at the end of the process when these modifiers are used. The HBPs reduce the glass transition temperature of the cured materials. In addition, from the DMA analysis it can be seen that the HBP modifier obtained from phenyl isocyanate hardly changes the storage modulus, but the obtained ones from t-butyl isocyanate decrease it. TG analysis reveals a decrease in the onset temperature of the degradation process upon addition of the HBPs.
    Grupo de investigación: Polimers
    Áreas temáticas: Chemistry Química Química
    Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 1388-6150
    Identificador del autor: 0000-0003-1387-0358; 0000-0002-9416-3657; 0000-0002-3492-2922; n/a; 0000-0003-2550-7185; n/a
    Fecha de alta del registro: 2016-04-14
    Página final: 654
    Volumen de revista: 127
    Versión del articulo depositado: info:eu-repo/semantics/submittedVersion
    Enlace a la fuente original: https://link.springer.com/article/10.1007/s10973-016-5376-z
    URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
    DOI del artículo: 10.1007/s10973-016-5376-z
    Entidad: Universitat Rovira i Virgili
    Año de publicación de la revista: 2016
    Página inicial: 645
    Tipo de publicación: Article Artículo Article
  • Palabras clave:

    Resines epoxídiques
    Polímers
    Epoxy networks
    Kinetics
    hyperbranched polymers
    Chemistry
    Química
    Química
    1388-6150
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