Forschung Zur Rubrik

Zwei grüne Balken mit jeweils weißer Beschriftung.
The dispersion as a Function of the Polymer and Carbon Black Type

Investigation of the Recipe ­specific Mixing Process to predict the Dispersion Quality

Rubber compounds are produced in a discontinuously working internal mixer with the addition of components such as rubber, fillers and other additives. A key factor to achieve a high compound quality is the dispersion of the filler. The aim of this study is to determine the dispersion as a function of the polymer and carbon black type. For this reason, ten rubber compounds based on two different ethylene-propylene-diene rubbers (EPDM) with a different molecular weight are produced. Furthermore, the incorporation of carbon blacks with a different structure and specific surface area is analysed. A dependence of the dispersion on the carbon black type used can be detected. A low structure and a high specific surface area result in a lower dispersion degree.

Horikx’s diagram plot for a pristine elastomer. The black line corresponds to pure random chain scission mechanism. The red line is the limit for pure selective crosslink scission mechanism.
End-of-life of scrap rubber is an important environmental issue

Application of Horikx’s Theory for devulcanized Scrap Rubbers

End-of-life of scrap rubber is an important environmental issue. Many studies have tried to develop or to improve recycling methods by means of devulcanization processes, if possible in a continuous way. In this frame, the Horikx’s theory is widely used to characterize devulcanized rubbers especially as a method to assess the degree and the quality of the devulcanization process. It aims at evaluating the relative degrees of scission of sulfur-sulfur bonds (S-S) or carbon-carbon bonds (C-C).

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