Comparison of three different scales techniques for the dynamic mechanical characterization of two polymers (PDMS and SU8)

¹ FEMTO-ST, Dép. MN2S, CNRS UMR 6174, Université de Franche-Comté, 32 avenue de l'Observatoire, 25044 Besançon Cedex, France
² FEMTO-ST, Dép. Mécanique Appliquée, CNRS UMR 6174, Université de Franche-Comté, 24 chemin de l'Épitaphe, 25000 Besançon, France

Corresponding author: patrick.delobelle@univ-fcomte.fr

Received: 10 February 2009
Accepted: 30 April 2009
Published online: 8 July 2009

Abstract

In this article the dynamic mechanical characterization of PDMS and SU8 resin using dynamic mechanical analysis, nanoindentation and the scanning microdeformation microscope have been presented. The methods are hereby explained, extended for viscoelastic behaviours, and their compatibility underlined. The storage and loss moduli of these polymers over a wide range of frequencies (from 0.01 Hz to some kHz) have been measured. These techniques are shown fairly matching and the two different viscoelastic behaviours of these two polymers have been exhibited. Indeed, PDMS shows moduli which still increase at 5 kHz whereas SU8 ones decrease much sooner. From a material point of view, the Havriliak and Negami model to estimate instantaneous, relaxed moduli and time constant of these materials has been identified.