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Effect of Simultaneous Use of Silica and Nanoclay in Rubber Compounds Based on Nitrile Rubber

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Abstract

The synergistic effect of simultaneous use of two reinforcing fillers in rubber compounds based on Acrylonitrile Butadiene Rubber (NBR) was investigated with mechanical and vulcanisation characteristics of the rubber compounds. The Wide-Angle X-ray Diffraction (WAXD) patterns showed that in hybrid compounds, no obvious peaks appeared. This indicated that the nanoclay was exfoliated. These results revealed that addition of the reinforcing filler, either nanoclay or silica, shortened the optimum cure time (t90) and also scorch time (ts1) of samples compared to that of pure NBR compound. In hybrid compounds, the reduction in optimum cure time and scorch time was higher than that of for silica-filled NBR or nanoclay-filled NBR compounds. This can be attributed to the synergistic effect between nanoclay and silica as two reinforcing agents in NBR compounds. Regardless the composition of the reinforcing filler, an increase of the relaxed storage modulus was observed, while the tand value was gradually decreased. For hybrid samples, the experimental values of dynamic modulus showed a positive deviation from the values obtained from the Modified Guth model. Hybrid compounds showed higher burst strength compared to silica or nanoclay filled NBR compounds.

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Authors and Affiliations

  1. Formulation and Development of Applications of Chemical and Polymeric Compounds Research Group, Chemical, Polymeric and Petrochemical Technology Development Research Division, Research Institute of Petroleum Industry, Tehran, Iran

    M. M. Salehi, T. Khalkhali & A. R. Dourbash

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  1. M. M. Salehi
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  2. T. Khalkhali
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  3. A. R. Dourbash
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Correspondence to M. M. Salehi.

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Salehi, M.M., Khalkhali, T. & Dourbash, A.R. Effect of Simultaneous Use of Silica and Nanoclay in Rubber Compounds Based on Nitrile Rubber. J Rubber Res 21, 165–181 (2018). https://doi.org/10.1007/BF03449168

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  • DOI: https://doi.org/10.1007/BF03449168

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