Environmental ageing of aerospace epoxy adhesive in bonded assembly configuration

Aerospace epoxy adhesive has been subjected to various environmental ageing processes. A comparative study is performed between ageing under vacuum and atmospheric pressure for various ageing temperatures. The macroscopic behaviour of the assemblies is investigated by single lap shear test. Glass tr...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2013-11, Vol.114 (2), p.621-628
Main Authors: Causse, Nicolas, Dantras, Eric, Tonon, Claire, Chevalier, Mathieu, Combes, Hélène, Guigue, Pascale, Lacabanne, Colette
Format: Article
Language:English
Subjects:
Adhesive bonding
Adhesives
Adhesives and sealants industry
Ageing
Analytical Chemistry
Applied sciences
Calorimetry
Chemical Sciences
Chemistry
Chemistry and Materials Science
Epoxy resins
Exact sciences and technology
Inorganic Chemistry
Measurement Science and Instrumentation
Physical Chemistry
Physical properties
Polymer industry, paints, wood
Polymer Sciences
Polymers
Properties and testing
Technology of polymers
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Summary:Aerospace epoxy adhesive has been subjected to various environmental ageing processes. A comparative study is performed between ageing under vacuum and atmospheric pressure for various ageing temperatures. The macroscopic behaviour of the assemblies is investigated by single lap shear test. Glass transition temperature of the bulk adhesive is followed by differential scanning calorimetry. Molecular mobility of the adhesive in service configuration is studied by dynamic dielectric spectroscopy. No significant difference is noticed due to an ageing under vacuum. A comparison between test results after each isotherm ageing highlights the temperature influence. For ageing of adhesive in a vitreous state, the crosslink density increases. For ageing of adhesive in a rubbery state, a severe decrease of glass transition is observed. The influence of additives and physical ageing is null. This plasticisation effect might be associated with the homogenisation of the structure of epoxy due to the molecular mobility of loose chains.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-013-3009-3