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
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/
Entity: Universitat Rovira i Virgili
Journal publication year: 2014
First page: 1830
Publication Type: Journal Publications
Repositori URV