Articles producció científica> Enginyeria Mecànica

A New Epoxy-Based Layered Silicate Nanocomposite Using a Hyperbranched Polymer: Study of the Curing Reaction and Nanostructure Development

  • Identification data

    Identifier: imarina:5128894
    Authors:
    Cortés P, Fraga I, Calventus Y, Román F, Hutchinson JM, Ferrando F
    Abstract:
    Polymer layered silicate (PLS) nanocomposites have been prepared with diglycidyl ether of bisphenol-A (DGEBA) epoxy resin as the matrix and organically modified montmorillonite (MMT) as the clay nanofiller. Resin-clay mixtures with different clay contents (zero, two, five and 10 wt%) were cured, both isothermally andnon-isothermally, using a poly(ethyleneimine) hyperbranched polymer (HBP), the cure kinetics being monitored by differential scanning calorimetry (DSC). The nanostructure of the cured nanocomposites was characterized by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM), and their mechanical properties were determined by dynamic mechanical analysis (DMA) and impact testing. The results are compared with an earlier study of the structure and properties of the same DGEBA-MMT system cured with a polyoxypropylene diamine, Jeffamine. There are very few examples of the use of HBP as a curing agent in epoxy PLS nanocomposites; here, it is found to enhance significantly the degree of exfoliation of these nanocomposites compared with those cured with Jeffamine, with a corresponding enhancement in the impact energy for nanocomposites with the low clay content of 2 wt%. These changes are attributed to the different cure kinetics with the HBP, in which the intra-gallery homopolymerization reaction is accelerated, such that it occurs before the bulk cross-linking reaction.
  • Others:

    Author, as appears in the article.: Cortés P, Fraga I, Calventus Y, Román F, Hutchinson JM, Ferrando F
    Department: Enginyeria Mecànica
    e-ISSN: 1996-1944
    URV's Author/s: Ferrando Piera, Francesc
    Keywords: Thermosets Thermomechanical properties Temperature Resin Performance Nanocomposites Morphology Montmorillonite Mechanical-properties Layered silicate Kinetics Isothermal cure Impact energy Hyperbranched polymer (hbp) Exfoliation Epoxy Differential scanning calorimetry (dsc) Clay montmorillonite layered silicate impact energy hyperbranched polymer (hbp) exfoliation epoxy differential scanning calorimetry (dsc)
    Abstract: Polymer layered silicate (PLS) nanocomposites have been prepared with diglycidyl ether of bisphenol-A (DGEBA) epoxy resin as the matrix and organically modified montmorillonite (MMT) as the clay nanofiller. Resin-clay mixtures with different clay contents (zero, two, five and 10 wt%) were cured, both isothermally andnon-isothermally, using a poly(ethyleneimine) hyperbranched polymer (HBP), the cure kinetics being monitored by differential scanning calorimetry (DSC). The nanostructure of the cured nanocomposites was characterized by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM), and their mechanical properties were determined by dynamic mechanical analysis (DMA) and impact testing. The results are compared with an earlier study of the structure and properties of the same DGEBA-MMT system cured with a polyoxypropylene diamine, Jeffamine. There are very few examples of the use of HBP as a curing agent in epoxy PLS nanocomposites; here, it is found to enhance significantly the degree of exfoliation of these nanocomposites compared with those cured with Jeffamine, with a corresponding enhancement in the impact energy for nanocomposites with the low clay content of 2 wt%. These changes are attributed to the different cure kinetics with the HBP, in which the intra-gallery homopolymerization reaction is accelerated, such that it occurs before the bulk cross-linking reaction.
    Thematic Areas: Química Odontología Medicina veterinaria Medicina i Materials science, multidisciplinary Materiais Interdisciplinar General materials science Engenharias iv Engenharias iii Engenharias ii Engenharias i Condensed matter physics Ciências biológicas ii Ciências biológicas i Ciências agrárias i Ciência de alimentos Ciência da computação Biotecnología Astronomia / física Arquitetura, urbanismo e design
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 19961944
    Author's mail: f.ferrando@urv.cat
    Author identifier: 0000-0003-4450-2734
    Last page: 1849
    Record's date: 2023-03-05
    Journal volume: 7
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://www.mdpi.com/1996-1944/7/3/1830
    Papper original source: Materials. 7 (3): 1830-1849
    APA: Cortés P, Fraga I, Calventus Y, Román F, Hutchinson JM, Ferrando F (2014). A New Epoxy-Based Layered Silicate Nanocomposite Using a Hyperbranched Polymer: Study of the Curing Reaction and Nanostructure Development. Materials, 7(3), 1830-1849. DOI: 10.3390/ma7031830
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.3390/ma7031830
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2014
    First page: 1830
    Publication Type: Journal Publications
  • Keywords:

    Materials Science, Multidisciplinary
    Thermosets
    Thermomechanical properties
    Temperature
    Resin
    Performance
    Nanocomposites
    Morphology
    Montmorillonite
    Mechanical-properties
    Layered silicate
    Kinetics
    Isothermal cure
    Impact energy
    Hyperbranched polymer (hbp)
    Exfoliation
    Epoxy
    Differential scanning calorimetry (dsc)
    Clay
    montmorillonite
    layered silicate
    impact energy
    hyperbranched polymer (hbp)
    exfoliation
    epoxy
    differential scanning calorimetry (dsc)
    Química
    Odontología
    Medicina veterinaria
    Medicina i
    Materials science, multidisciplinary
    Materiais
    Interdisciplinar
    General materials science
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Engenharias i
    Condensed matter physics
    Ciências biológicas ii
    Ciências biológicas i
    Ciências agrárias i
    Ciência de alimentos
    Ciência da computação
    Biotecnología
    Astronomia / física
    Arquitetura, urbanismo e design
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