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Effects of Co-Silanized Silica on the Mechanical Properties and Thermal Characteristics of Natural Rubber/Styrene-Butadiene Rubber Blend

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Abstract

The main aim of this study is to improve the mechanical and thermal stability of the NR/SBR blend using nanosilica. The used nanosilica particles were extracted from hexafluorosilicic acid (H2SiF6) via direct precipitation, using a 20% NH3 solution; after which, they were co-modified with p-tolyltriethoxy silane (PTTES) and bis-(γ-triethoxysilylpropyl)-tetrasulfide (Si-69) silane coupling agents. Many techniques such as the thermal gravimetric analysis (TGA), Fourier-transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS), were applied to characterize the obtained nanosilica, and to confirm the success of the silanization. The co-modified silica was incorporated into the NR/SBR blend by a conventional two-roll mixing mill and an internal closed mixer, to prepare silica/NR/SBR composites. The morphological, mechanical, rheological, and thermal characteristics of the nanosilica-reinforced NR/SBR rubber blend were also examined in detail. The results indicated that the co-modified silica was an effective reinforcement material for the NR/SBR blend, and that it improved the mechanical properties and thermal stability of the bound rubber. The tensile strength and hardness of the 4 wt.% co-SiO2/NR/SBR composite were higher by 35.23% and 20.12%, respectively, compared with those of the pristine NR/SBR (80/20) blend, in addition to a higher residual char content and decomposition temperature, obtained from thermal degradation.

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Acknowledgments

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 104.02-2017.15 (for Cuong Manh Vu).

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Authors and Affiliations

  1. Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Quang-Vu Bach

  2. Institute of Research and Development, Duy Tan University, Da Nang, 550000, Vietnam

    Cuong Manh Vu

  3. AQP Research and Control Pharmaceuticals Joint Stock Company (AQP Pharma J.S.C) Dong Da, Ha Noi, Vietnam

    Huong Thi Vu

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  1. Quang-Vu Bach
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Bach, QV., Vu, C.M. & Vu, H.T. Effects of Co-Silanized Silica on the Mechanical Properties and Thermal Characteristics of Natural Rubber/Styrene-Butadiene Rubber Blend. Silicon 12, 1799–1809 (2020). https://doi.org/10.1007/s12633-019-00281-8

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