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

  • Identification data

    Identifier: imarina:6388606
    Authors:
    Morancho JFernández-Francos XAcebo CRamis XSalla JSerra
    Abstract:
    © 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.
  • Others:

    Author, as appears in the article.: Morancho J; Fernández-Francos X; Acebo C; Ramis X; Salla J; Serra
    Department: Química Analítica i Química Orgànica
    URV's Author/s: Fernández Francos, Xavier / Serra Albet, Maria Angels
    Keywords: Toughening mechanisms Thermosets Thermal curing Rubber Polymers Networks Morphology Matrix resin Kinetics Hyperbranched polymers Epoxy networks Diglycidyl ether Bisphenol-a
    Abstract: © 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.
    Thematic Areas: 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
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 14182874
    Author's mail: xavier.fernandez@urv.cat angels.serra@urv.cat
    Author identifier: 0000-0002-3492-2922 0000-0003-1387-0358
    Record's date: 2023-07-31
    Papper version: info:eu-repo/semantics/acceptedVersion
    Link to the original source: https://link.springer.com/article/10.1007/s10973-016-5376-z
    Papper original source: Journal Of Thermal Analysis And Calorimetry. 127 (1): 645-654
    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
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.1007/s10973-016-5376-z
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2017
    Publication Type: Journal Publications
  • Keywords:

    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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