2017 Volume 17 Issue 2 Pages 103-108
In this study, to investigate the influence of the measuring frequency on thermo-viscoelastic properties of polymers, dynamic mechanical analyses (DMA, 0.01-0.1 Hz and 0.5-10 Hz) and immersion ultrasonic testing (1-5 MHz) were carried out. In the ultrasonic testing, loss tangent (tan δ) was derived from the phase velocity and attenuation coefficient. The frequency dispersion curves of tan δ measured at several temperatures were incorporated in a single curve (the master curve) by shifting datasets parallel to the logarithmic frequency axis. That is, it was able to estimate the thermo-viscoelastic properties of a soft epoxy resin by applying the time-temperature superposition principle. As a result of comparing both master curves of tan δ obtained by the ultrasonic testing and DMA testing, they were identical qualitatively, but the difference appeared in the viscosity behavior.
