Autor segons l'article: Cortés P, Fraga I, Calventus Y, Román F, Hutchinson JM, Ferrando F
Departament: Enginyeria Mecànica
e-ISSN: 1996-1944
Autor/s de la URV: Ferrando Piera, Francesc
Paraules clau: 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)
Resum: 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.
Àrees temàtiques: 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
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 19961944
Adreça de correu electrònic de l'autor: f.ferrando@urv.cat
Identificador de l'autor: 0000-0003-4450-2734
Pàgina final: 1849
Data d'alta del registre: 2023-03-05
Volum de revista: 7
Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
Enllaç font original: https://www.mdpi.com/1996-1944/7/3/1830
URL Document de llicència: http://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Materials. 7 (3): 1830-1849
Referència de l'ítem segons les normes 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
DOI de l'article: 10.3390/ma7031830
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2014
Pàgina inicial: 1830
Tipus de publicació: Journal Publications
Repositori URV