Caractérisation in situ de systèmes polymères adhésifs en couches minces : approche expérimentale et modélisation

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URI: http://hdl.handle.net/2042/16095
Title: Caractérisation in situ de systèmes polymères adhésifs en couches minces : approche expérimentale et modélisation
Author: LE CORRE, Steven; DELAUNAY, Didier; POITOU, Arnaud; JOUILLAT, Jean-François; JONGSMA, Jelmer E.
Abstract: A blend of polyolefins, polypropylene and polyethylene, has been studied in a thin film composition in which it aims the function of adhesive and peelable structure. The blend is covered by several organic layers and is finally supported at both sides by metal substrates. The layer thickness is typically in the order of 10 µm, in which the identification of the mechanical properties requires rather in situ experiments than studying the bulk properties. This study shows in situ experimental results and modelling of the structure under constant shear load. The experiments have been performed on several sample dimensions at 130°C. Experimental results do match with visco-elastic behaviour according a three elements model. Modelling of the shear experiment shows heterogeneous stress distribution in the thin layer but leaves the explanation of the results open. A specific result of this paper, raising more questions than answers, is that when changing the length of the sheared zone, the resulting strain rate is a function of the total applied load instead of the expected average shear stress. Further experimental analysis should clarify the real failure mechanisms.
Subject: S5 Comportement des matériaux ; Lois de comportement; caractérisation; films polymères; viscoélasticité
Publisher: AFM, Maison de la Mécanique, 39/41 rue Louis Blanc - 92400 Courbevoie
Date: 2007-08-29

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