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Dispersion mechanisms of agglomerated fillers in a rubber matrix : Contribution of in-situ observations

Abstract : Abstract: The fragmentation behaviour of different agglomerated fillers (carbon black pellets and amorphous precipitated silica micropearls) in a common polymer matrix (styrene-co-butadiene rubber) was investigated by in-situ observations under shear. This was done thanks to a transparent counter-rotating shear cell coupled with optical microscopy. Different elementary mechanisms of dispersion were evidenced and characterized. Criteria for dispersion and erosion kinetics were determined. Carbon black pellets and silica micropearls showed different elementary mechanisms for dispersion. A relationship between the criterion for fragmentation and the internal organisation of the agglomerate could be established. These in-situ observations allow us to study the first steps of dispersion down to the micron size. They show that an efficient mechanism of dispersion (rupture or disintegration) is first necessary to reduce the agglomerate size during a mixing operation. However this mechanism is limited down to a certain size. Erosion then becomes the dominant mechanism to decrease the fragment size.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01502223
Contributor : Nadine Alziary - Manuel <>
Submitted on : Friday, April 7, 2017 - 2:44:12 PM
Last modification on : Wednesday, October 14, 2020 - 4:02:06 AM

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  • HAL Id : hal-01502223, version 1

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Edith Peuvrel-Disdier. Dispersion mechanisms of agglomerated fillers in a rubber matrix : Contribution of in-situ observations. Eurofillers Polyblends 2015, Apr 2015, Montpellier, France. 2p. ⟨hal-01502223⟩

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