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Assessment of the mechanical properties of nanoclays enhanced low Tg epoxy resins

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Abstract

The mechanical properties of the nanocomposites are dependent, not only of the clays content but, also, of the resin type and manufacturing process. In this context, the present study intends to develop a systematic study involving a low glass transition temperature (Tg) and low permeability epoxy resin (SR 1500 and the hardener SD 2503) with a commercially Nanomer I30 E nanoclays. Two dispersion processes were compared (direct (DM) and indirect method (IDM)) in terms of mechanical properties, as well as the influence of nanoclay content and hydro aging effect. It was possible to observe that the composites obtained by the indirect method present lower mechanical properties than the neat resin because there is residual acetone. For DM composites the tensile strength, fracture toughness and the specific energy absorbed by impact decreases with the reinforcement content, caused by particle agglomerates. Elastic modulus, at 25 °C, increases significantly and Tg increases slightly with the addition of nanoclays. Hydro aging promotes a progressive decreasing of the tensile strength and fracture toughness, with the clay content, reaching about 15 % and 7 %, respectively, for 6 wt% of nanoclays. On the other hand, a small increasing on specific energy absorbed was observed.

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Authors and Affiliations

  1. CEMUC, University of Coimbra, Coimbra, Portugal

    J. A. M. Ferreira, J. D. M. Costa & C. Capela

  2. Mechanical Engineering Department, University of Coimbra, Coimbra, Portugal

    J. A. M. Ferreira & J. D. M. Costa

  3. Department of Electromechanical Engineering, University of Beira Interior, Covilhã, Portugal

    P. N. B. Reis

  4. Mechanical Engineering Department, ESTG, Polytechnic Institute of Leiria, Leiria, Portugal

    C. Capela

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  1. J. A. M. Ferreira
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  2. P. N. B. Reis
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  3. J. D. M. Costa
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  4. C. Capela
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Correspondence to P. N. B. Reis.

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Ferreira, J.A.M., Reis, P.N.B., Costa, J.D.M. et al. Assessment of the mechanical properties of nanoclays enhanced low Tg epoxy resins. Fibers Polym 15, 1677–1684 (2014). https://doi.org/10.1007/s12221-014-1677-7

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  • DOI: https://doi.org/10.1007/s12221-014-1677-7

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