Next Article in Journal
Next Article in Special Issue
Previous Article in Journal
Previous Article in Special Issue
Materials 2014, 7(3), 1830-1849; doi:10.3390/ma7031830
Article

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

1
, 2
, 3
, 3
, 3,*  and 4
Received: 28 November 2013; in revised form: 14 February 2014 / Accepted: 17 February 2014 / Published: 4 March 2014
(This article belongs to the Special Issue Nanocomposites of Polymers and Inorganic Particles 2013)
View Full-Text   |   Download PDF [1932 KB, updated 5 March 2014; original version uploaded 4 March 2014]   |   Browse Figures
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 and non-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.
Keywords: hyperbranched polymer (HBP); differential scanning calorimetry (DSC); exfoliation; epoxy; montmorillonite; impact energy; nanocomposites; layered silicate hyperbranched polymer (HBP); differential scanning calorimetry (DSC); exfoliation; epoxy; montmorillonite; impact energy; nanocomposites; layered silicate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Cortés, P.; Fraga, I.; Calventus, Y.; Román, F.; Hutchinson, J.M.; Ferrando, F. A New Epoxy-Based Layered Silicate Nanocomposite Using a Hyperbranched Polymer: Study of the Curing Reaction and Nanostructure Development. Materials 2014, 7, 1830-1849.

AMA Style

Cortés P, Fraga I, Calventus Y, Román F, Hutchinson JM, Ferrando F. A New Epoxy-Based Layered Silicate Nanocomposite Using a Hyperbranched Polymer: Study of the Curing Reaction and Nanostructure Development. Materials. 2014; 7(3):1830-1849.

Chicago/Turabian Style

Cortés, Pilar; Fraga, Iria; Calventus, Yolanda; Román, Frida; Hutchinson, John M.; Ferrando, Francesc. 2014. "A New Epoxy-Based Layered Silicate Nanocomposite Using a Hyperbranched Polymer: Study of the Curing Reaction and Nanostructure Development." Materials 7, no. 3: 1830-1849.


Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert