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Evolution of transient states and properties of an epoxy-silica hybrid cured at ambient temperature

journal contribution
posted on 30.04.2015, 13:02 authored by Francesca Lionetto, Leno Mascia, Mariaenrica Frigione
An epoxy-silica hybrid was produced from a mixture of an amine-silane functionalized bisphenol-A resin and a siloxane precursor derived from tetraethoxysilane with small amounts of glycidoxypropyltrimethoxysilane coupling agent. The low temperature curing characteristics and final properties of the hybrid system were compared to those of two epoxy controls. Examinations were carried out by differential scanning calorimetry, dynamic mechanical analysis, electron microscopy, thermogravimetric analysis, UV-Vis spectroscopy, SAXS and densitometry. The modulus, strength and ductility were measured in 3-point bending mode at 23 and 50 °C. The siloxane hybridization of the original epoxy resin was found to increase the glass transition temperature (Tg) of cold cured systems by more than 10 °C and to produce large improvements in mechanical properties. The study has also provided new insights for the events taking place during gelation, vitrification and curing to the equilibrium state. © 2013 Elsevier B.V. All rights reserved.

Funding

The experimental research and the instrumentations used were partially financed by PON 2007-2013 “IT@CHA - Italian Technologies for Advanced Applications in Cultural Heritage Assets” and Apulia Regional funds in the framework ‘Network of Public Research Laboratories’, Project: Applied Innovation Technologies for Diagnosis and Conservation of Built Heritage – A.I.Te.C.H. (2010-12).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

European Polymer Journal

Volume

49

Issue

6

Pages

1298 - 1313

Citation

LIONETTO, F., MASCIA, L. and FRIGIONE, M., 2013. Evolution of transient states and properties of an epoxy-silica hybrid cured at ambient temperature. European Polymer Journal, 49 (6), pp. 1298 - 1313.

Publisher

© Elsevier Ltd

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2013

Notes

This article is closed access.

ISSN

0014-3057

Language

en