Abstract
A series of kaolin/styrene–butadiene rubber (SBR) nanocomposites were prepared by melt blending. The scanning electron microscopy images of the kaolin/SBR nanocomposites showed that the kaolin particles were disorderly and finely dispersed in the SBR matrix. The layer-like particles also had the diameters of 300nm to 700nm and the thicknesses of 50nm to 150nm. Compared with pure SBR, the kaolin/SBR nanocomposites exhibited excellent gas barrier properties, and the oxygen permeability of the kaolin/SBR nanocomposites decreased by 64% with increased kaolin content to 80phr. The gas barrier properties of the kaolin/SBR nanocomposites were much better than those of SBR materials filled with precipitated silica or carbon black. The physical dispersion of kaolin layer-like particles had a significant effect on gas barrier property of kaolin/rubber composites. The gas barrier model of the kaolin/SBR nanocomposite was proposed based on the Nielsen model. The results showed that the overall orientation angle of the kaolin layer-like particles in the SBR matrix was approximately 30° to 45°, and which would decrease with increased kaolin content.
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