Formation of Network by Carbon Black，Silica and Their Mixing Fillers in Isoprene Rubber北大核心CSCD

The network formed by fillers has great influence on the mechanical properties of rubber materials. To understand the formation of network by carbon black，silica，and carbon black/silica mixing fillers in rubber and its influence on the properties of rubber，isoprene rubber/filler composites with different filler loadings are prepared and their micromorphology，rheological and tensile properties are investigated. It is found that the dispersion of fillers is better in rubber after cure than that in rubber before cure for all three rubber systems，and the filler size of silica is smaller than that of carbon black，but the aggregation is more severe in silica filled rubber system. In mixed filler system，the two fillers tend to aggregate separately， leading to the low modulus at small strain than that in single filler system. With the increase of the filler loading，the tensile strength increases first and then decreases，the elongation at break decreases，and the temperature rise in compression flexometer tests increases. Moreover，the temperature rise in mixed filler system is higher than that in single filler system at high filler loading. © 2022, Science Press (China). All rights reserved.