DYNAMIC PROPERTIES OF CARBON-BLACK-FILLED VULCANIZATES AND SHIFT FACTORS

SBR vulcanizates filled with 13 rubber-grade carbon blacks were used t o demonstrate that the curves of dynamic rubber properties, namely ela stic modulus and loss tangent vs. filler loading can be superpose to a single master curve by introduction of a shift factor f. The same had been reported previously for static properties. Whereas the shift fac tor for elastic modulus is mainly determined by carbon black structure , the shift factor for tan delta is governed by interaggregate distanc e which is related to the specific surface area of the carbon blacks. Surface energy also plays an important role with regard to the shift f actors due to its influence on filler-filler and polymer-filler intera ction.