Rubber is a living material. During mechanical loading, rubber changes its mechanical behavior due to inner structural changes on the molecular scale. The investigation of carbon black-filled rubber compounds provides vital information about the structure of rubber, the molecular mobility and the size of carbon black clusters.
With simultaneous DMA and DEA, the dynamic mechanical and dielectric properties of carbon black-filled rubber compounds can be analyzed.
Why simultaneous dynamic-mechanical and dielectric analysis?
Dynamic-mechanical analysis (DMA) supplies global properties like stiffness and damping. These properties depend, for instance, on temperature, load conditions and frequency. The technique allows the quantification of viscoelastic properties from linear to non-linear material behavior. Therefore, DMA helps generate a global understanding of material properties.
However, DMA is limited. Information on the nanoscale can be generated with dielectric analysis (DEA) as the technique gives insights into the internal structure of rubber such as orientation and size of carbon black clusters within the rubber.
Only by combining DMA and DEA into a simultaneous analysis can one clearly understand changes in the structure, size and distribution of the cluster structure within the polymer matrix due to and during dynamic mechanical loading.
Dr. Horst Deckmann (Business Field Manger Rubber & Tire) explains the working principle of the DMA GABO DiPLEXOR® and shows an application example that highlights the importance of investigation rubber compounds on a nanoscale.
Dielectric properties under static load on a filled SBR sample
It is common knowledge that there is a connection between the static force applied on a sample and the conductivity of the material. Additionally, aging processes like exposure to UV light, radiation and temperature cycles have significant effects on the material. These can easily be identified by looking at the conductivity.
The DMA GABO DiPLEXOR® allows investigation of the dynamics of the filler network during mechanical load and under real conditions. Watch the video to get the full overview!