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Correlation between Sub-Tg relaxation processes and mechanical behavior for different hydrothermal ageing conditions in epoxy assemblies

Chevalier, Mathieu and Dantras, Eric and Tonon, Claire and Guigue, Pascale and Lacabanne, Colette and Puig, C. and Durin, Christian Correlation between Sub-Tg relaxation processes and mechanical behavior for different hydrothermal ageing conditions in epoxy assemblies. (2010) Journal of Applied Polymer Science, vol. 115 (n° 2). pp. 1208-1214. ISSN 0021-8995

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Official URL: http://dx.doi.org/10.1002/app.31253

Abstract

The aim of this study is to understand aging phenomena by monitoring physical parameters after real and simulated aging experiments. This study focuses on aluminum-epoxy assemblies, which are commonly used on spacecraft structures. Different samples are submitted to simulated aging tests. Influence of temperature and moisture is analyzed. Evolution with aging is characterized at two different scales. The macroscopic behavior of the assemblies is studied by single lap shear test. A decrease in the shear rupture stress is observed with increasing temperature and relative humidity. It is demonstrated that temperature has more important influence. The molecular behavior in the adhesive joint is studied by dynamic dielectric spectroscopy measurements. This experiment gives access to molecular mobility in the adhesive. Dipolar entities are identified as evolving with aging conditions. The temperature is more effective than moisture at this scale. An interpretation of the molecular mobility before and after aging shows that water is an important parameter of this study. A link between mechanical and molecular behavior with hydrothermal aging is found. The decrease of mechanical properties occurs while failures become interfacial. In the same time, the interactions between hydroxyether and water increase. The evolution of the macroscopic behavior of the bonded assemblies is due to this combination observed at different scales.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available at http://eu.wiley.com/WileyCDA/Section/index.html The original PDF of the article can be found at Journal of Applied Polymer Science website : http://www3.interscience.wiley.com/journal/122597167/abstract
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > EADS - Astrium (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Centre National des Etudes Spatiales - CNES
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Nihad Lahdifi

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