Technical Paper Archive

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Contrasting the Rheology of Particle Reinforced Rubbers Versus Particle Reinforced Newtonian Fluids

C14 kollar

Event: 200th Technical Meeting - Fall 2021
Location: Pittsburgh, PA
Date: October 05, 2021
Author: James Kollar
Paper Number: C14

Price: $20.00

  • The complex rheological behavior of particle reinforced green rubbers plays a key role in determining final rubber product dynamic mechanical performance. Despite this significance, several rheological features of green rubbers, including the so-called “flocculation” effect, are still incompletely understood at the microstructural level. In this work we explore the rheological behavior of carbon black reinforced green rubbers and analogous carbon black reinforced Newtonian mineral oils in order to extract new understandings of the key physical features of the particle-particle networks in both systems.
    Both sets of materials undergo thermally activated flocculation to different rates and ultimate extents. This provides evidence that the critically important non-entropic temperature dependence of the small strain dynamic modulus in filled rubbers can be traced back in part to the dynamics of the particle-particle network.
    It is demonstrated that the carbon black network in the Newtonian oil displays a weak frequency dependence – despite the oil matrix having no frequency dependence. Again this implies that the filler network possess its own unique dynamic signature.
    Finally Fourier Transform (FT) Rheometry is performed on the materials and a key difference is observed between the rubber compounds – which display the characteristic non-linear dichotomy of filled rubbers – and the Newtonian oils for which we observe severe distortions of the Lissajous plots depending on the applied strain levels. This is consistent with other findings in the literature and can likely be traced back to the contrasting molecular weights and relaxation times of the different matrices relative to the deformation frequency.

    Papers from 200th Technical Meeting - Fall 2021

    Items from 200th Technical Meeting - Fall 2021