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Influence of the epoxidation degree of a polystyrene–polybutadiene–polystyrene (SBS) triblock copolymer on the compatibilization with an organomodified nanoclay

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Abstract

In this work, the addition of organophilic-modified montmorillonite into polystyrene–polybutadiene–polystyrene (SBS) triblock copolymers was investigated with and without the use of epoxidized SBS as a compatibilization agent. The nanocomposites were prepared by melting mixture at 60 rpm and 130 °C. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM), tensile tests, and dynamic-mechanical analysis (DMA). XRD and TEM showed the formation of an intercalated dispersion of clay platelets oriented on the SBS surface. The AFM showed the typical lamellar microstructure of the styrene and butadiene phases of SBS. The estimation of the average distance between the styrene lamellae by AFM analysis showed that the platelets are anchored between the phases, and this structural feature caused an increase in elastic modulus. DMA analysis showed that the T g of butadiene decreased in the nanocomposites. The decrease of the T g and the increase in the elastic modulus are correlated to mechanisms at the micro- and the macro-scales, respectively. The decrease in the T g indicates flexibilization at the interface, whereas the intercalation of the platelets restricted the interphase macroscale deformation.

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Acknowledgements

The authors gratefully acknowledged the Brazilian National Counsel of Technological and Scientific Development—CNPq and PRONEX/FAPERGS and FAPERJ for the financial support. The authors thank Marly A. M. Jacobi for providing the epoxidized rubber.

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Authors and Affiliations

  1. Universidade Federal do Rio Grande do Sul – UFRGS/Instituto de Química –IQ/PGCIMAT, Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91501-970, Brazil

    Patrícia A. da Silva, Vinícius Pistor, Gustavo P. O. Gonçalves, Kelly S. Santos, Ricardo V. B. de Oliveira & Raquel S. Mauler

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  1. Patrícia A. da Silva
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  2. Vinícius Pistor
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  3. Gustavo P. O. Gonçalves
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  4. Kelly S. Santos
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  5. Ricardo V. B. de Oliveira
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  6. Raquel S. Mauler
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Correspondence to Raquel S. Mauler.

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da Silva, P.A., Pistor, V., Gonçalves, G.P.O. et al. Influence of the epoxidation degree of a polystyrene–polybutadiene–polystyrene (SBS) triblock copolymer on the compatibilization with an organomodified nanoclay. J Mater Sci 49, 3622–3628 (2014). https://doi.org/10.1007/s10853-014-8054-1

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  • DOI: https://doi.org/10.1007/s10853-014-8054-1

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