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.