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Morphology and viscoelastic behavior of silicone rubber/EPDM/Cloisite 15A nanocomposites based on Maxwell model

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Abstract

Blends of silicone rubber (SR) and ethylene propylene diene monomer (EPDM) are immiscible due to different polarity and poor interfacial surface tension between their rubber chains. In this study, compatibilizing effect of a nanoclay addition in SR/EPDM blends was investigated. Viscoelasticity and morphology of nanocomposites based on SR and EPDM, containing 10, 20 and 30 wt% of EPDM and 3, 6 and 9 phr of nanoclay (Cloisite 15A), were studied. The curing behavior of the samples showed that the vulcanization rate and cross-link density of the blends increased with increases in SR content. Morphological study was conducted by XRD, SEM and EDX analyses and they indicated that the nanoparticles tended to disperse in the EPDM phase and consequently caused hardness and the elasticity of this phase in nanocomposites increased. Tensile properties of the samples showed a good fitting between that of experiments and the Maxwell model at initial time of testing (1.5 s) for all the blends. Sample parameters including modulus (E), viscosity (η) and relaxation time (τ) calculated by the Maxwell model revealed that those samples with higher content of nanoparticles exhibit higher modulus and lower relaxation time. The good match in tensile properties based on Maxwell model and those of the experimental data was attributed to good dispersion of nanoclay in the blends.

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Notes

  1. Dimethyl, dehydrogenated, tallow quaternary ammonium chloride.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran

    Leila Bazli, Alireza Khavandi & Mohammad Ali Boutorabi

  2. Center of Excellence for High Strength Alloys Technology (CEHSAT), Tehran, Iran

    Mohammad Ali Boutorabi

  3. Rubber Group, Iran Polymer and Petrochemical Institute, Nano and Smart Polymers Center of Excellence, Tehran, Iran

    Mohammad Karrabi

Authors
  1. Leila Bazli
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  2. Alireza Khavandi
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  3. Mohammad Ali Boutorabi
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  4. Mohammad Karrabi
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Correspondence to Mohammad Karrabi.

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Bazli, L., Khavandi, A., Boutorabi, M.A. et al. Morphology and viscoelastic behavior of silicone rubber/EPDM/Cloisite 15A nanocomposites based on Maxwell model. Iran Polym J 25, 907–918 (2016). https://doi.org/10.1007/s13726-016-0477-x

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