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

  • Dades identificatives

    Identificador: PC:1438
    Autors:
    À. SerraJ.M. MoranchoX. Fernández-FrancosC. AceboX. RamisJ.M. Salla
    Resum:
    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.
  • Altres:

    Autor segons l'article: À. Serra; J.M. Morancho; X. Fernández-Francos; C. Acebo; X. Ramis; J.M. Salla
    Departament: Química Analítica i Química Orgànica
    Autor/s de la URV: SERRA ALBET, MARIA ANGELS; J.M. Morancho; X. Fernández-Francos; C. Acebo; X. Ramis; J.M. Salla
    Paraules clau: Epoxy networks Kinetics hyperbranched polymers
    Resum: 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.
    Grup de recerca: Polimers
    Àrees temàtiques: Chemistry Química Química
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 1388-6150
    Identificador de l'autor: 0000-0003-1387-0358; 0000-0002-9416-3657; 0000-0002-3492-2922; n/a; 0000-0003-2550-7185; n/a
    Data d'alta del registre: 2016-04-14
    Pàgina final: 654
    Volum de revista: 127
    Versió de l'article dipositat: info:eu-repo/semantics/submittedVersion
    Enllaç font original: https://link.springer.com/article/10.1007/s10973-016-5376-z
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    DOI de l'article: 10.1007/s10973-016-5376-z
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2016
    Pàgina inicial: 645
    Tipus de publicació: Article Artículo Article
  • Paraules clau:

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