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

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

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

Article's DOI: 10.3390/ma7031830

Entity: Universitat Rovira i Virgili

Journal publication year: 2014

First page: 1830

Publication Type: Journal Publications