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: imarina:6388606
    Autores:
    Morancho JFernández-Francos XAcebo CRamis XSalla JSerra
    Resumen:
    © 2016, Akadémiai Kiadó, Budapest, Hungary. 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: Morancho J; Fernández-Francos X; Acebo C; Ramis X; Salla J; Serra
    Departamento: Química Analítica i Química Orgànica
    Autor/es de la URV: Fernández Francos, Xavier / Serra Albet, Maria Angels
    Palabras clave: Toughening mechanisms Thermosets Thermal curing Rubber Polymers Networks Morphology Matrix resin Kinetics Hyperbranched polymers Epoxy networks Diglycidyl ether Bisphenol-a
    Resumen: © 2016, Akadémiai Kiadó, Budapest, Hungary. 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.
    Áreas temáticas: Zootecnia / recursos pesqueiros Thermodynamics Saúde coletiva Química Polymers and plastics Physical and theoretical chemistry Odontología Nutrição Medicina ii Medicina i Materials chemistry Materiais Interdisciplinar Geociências Farmacia Ensino Engenharias iv Engenharias iii Engenharias ii Engenharias i Educação Economia Dentistry (all) Condensed matter physics Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Ciência de alimentos Chemistry, physical Chemistry, analytical Biotecnología Biodiversidade Astronomia / física Arquitetura e urbanismo
    Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 14182874
    Direcció de correo del autor: xavier.fernandez@urv.cat angels.serra@urv.cat
    Identificador del autor: 0000-0002-3492-2922 0000-0003-1387-0358
    Fecha de alta del registro: 2023-07-31
    Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion
    Enlace a la fuente original: https://link.springer.com/article/10.1007/s10973-016-5376-z
    Referencia al articulo segun fuente origial: Journal Of Thermal Analysis And Calorimetry. 127 (1): 645-654
    Referencia de l'ítem segons les normes APA: Morancho J; Fernández-Francos X; Acebo C; Ramis X; Salla J; Serra (2017). Thermal curing of an epoxy-anhydride system modified with hyperbranched poly(ethylene imine)s with different terminal groups. Journal Of Thermal Analysis And Calorimetry, 127(1), 645-654. DOI: 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: 2017
    Tipo de publicación: Journal Publications
  • Palabras clave:

    Chemistry, Analytical,Chemistry, Physical,Condensed Matter Physics,Physical and Theoretical Chemistry,Thermodynamics
    Toughening mechanisms
    Thermosets
    Thermal curing
    Rubber
    Polymers
    Networks
    Morphology
    Matrix resin
    Kinetics
    Hyperbranched polymers
    Epoxy networks
    Diglycidyl ether
    Bisphenol-a
    Zootecnia / recursos pesqueiros
    Thermodynamics
    Saúde coletiva
    Química
    Polymers and plastics
    Physical and theoretical chemistry
    Odontología
    Nutrição
    Medicina ii
    Medicina i
    Materials chemistry
    Materiais
    Interdisciplinar
    Geociências
    Farmacia
    Ensino
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Engenharias i
    Educação
    Economia
    Dentistry (all)
    Condensed matter physics
    Ciências biológicas iii
    Ciências biológicas ii
    Ciências biológicas i
    Ciências ambientais
    Ciências agrárias i
    Ciência de alimentos
    Chemistry, physical
    Chemistry, analytical
    Biotecnología
    Biodiversidade
    Astronomia / física
    Arquitetura e urbanismo
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