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Photoageing behaviour of epoxy nanocomposites: Comparison between spherical and lamellar nanofillers |
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| Authors: | Benedicte Mailhot Sandrine Morlat-Thérias Loic Le Pluart Henry Sautereau Jean-Luc Gardette |
| Institution: | a Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR CNRS-UBP 6505, Université Blaise Pascal, Ensemble Universitaire des Cézeaux, 63177 Aubière Cedex, France b Institut Universitaire de Technologie, Université d'Auvergne, Ensemble Universitaire des Cézeaux, B.P. 86, 63172 Aubière Cedex, France c Laboratoire des Matériaux Macromoléculaires, INSA de Lyon, UMR CNRS 5627, 20 Avenue Albert Einstein, 69621 Villeurbanne Cedex, France |
| Abstract: | The photochemical behaviour of a nanofilled epoxy resin has been studied. It has been shown that the filler content increases at the surface with irradiation time. Qualitative stiffness and adhesion measurements compare the surface properties of the filled and unfilled samples upon ageing. Depth profiling has been achieved by AFM nanoindentation and micro-FTIR. These two techniques allowed comparing stiffness and photooxidation of the aged samples. Both techniques showed an influence of nanofillers on thickness profiles. The relationship between the oxidation process and its consequences on the physical properties is explained taking into account oxygen permeability and light diffusion. Additionally, it has been shown that, whatever the content (5-10 wt%), the nature (silica or different organo-modified montmorillonites) or the shape of the filler (spherical or lamellar), the photoproducts were formed in comparable proportions and at similar rates as in the pristine matrix. |
| Keywords: | Epoxy Nanocomposite Irradiation Oxidation AFM nanoindentation |
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