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Structure and properties of natural rubber/butadiene rubber (NR/BR) blend/sodium-montmorillonite nanocomposites prepared via a combined latex/melt intercalation method

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Abstract

75/25 (wt %) NR/BR blend/clay nanocomposites were prepared via a combined latex/melt intercalation method, for the first time. At first, NR latex was mixed with various amounts of the aqueous sodium montmorillomte (Na-MMT) dispersion. Obtained mixtures were co-coagulated by dilute solution of the sulfuric acid, washed several times with the distilled water and dried under vacuum. The NR/ clay compounds were then mixed with given amounts of the BR and vulcanizing ingredients in a 6-inch two-roll mill and then vulcanized at 150°C in a hot press. The nanocomposites have better mechanical properties than the clay-free NR/BR blend vulcanizates. Furthermore, modulus and hardness (Shore A) increased by increase of the clay loading in the range of 0–15 phr while tensile strength and elongation at break increased with increasing the clay content up to 5 phr and then decreased gradually by further increase of the clay loading. It was concluded from results of the XRD and mechanical test that nanocomposites containing less than 10 phr clay may show the fully exfoliated structure. With increasing the clay content to 10 and 15 phr, both non-exfoliated (stacked layers) and exfoliated structures may be observed simultaneously in the nanocomposites. TGA results indicated an improvement in main and end decomposition by increasing the clay loading.

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Authors and Affiliations

  1. Polymer Synthesis Research Center, Polymer Science and Technology Division, Research Institute of Petroleum Industry (RIPI), P. O. Box: 14665-137, Tehran, Iran

    Mahdi Abdollahi, Homayon Hossein Khanli, Jamal Aalaie & Mohammad Reza Yousefi

Authors
  1. Mahdi Abdollahi
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  2. Homayon Hossein Khanli
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  3. Jamal Aalaie
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  4. Mohammad Reza Yousefi
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Correspondence to Mahdi Abdollahi.

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Abdollahi, M., Khanli, H.H., Aalaie, J. et al. Structure and properties of natural rubber/butadiene rubber (NR/BR) blend/sodium-montmorillonite nanocomposites prepared via a combined latex/melt intercalation method. Polym. Sci. Ser. A 53, 1175–1181 (2011). https://doi.org/10.1134/S0965545X11120091

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  • DOI: https://doi.org/10.1134/S0965545X11120091

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