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Journal of Materials Science

, Volume 50, Issue 14, pp 4845–4859 | Cite as

Analyzing the influence of particle size and stiffness state of the nanofiller on the mechanical properties of epoxy/clay nanocomposites using a novel shear-stiff nano-mica

  • Martin Heinz Kothmann
  • Mazen Ziadeh
  • Gökhan Bakis
  • Agustin Rios de Anda
  • Josef Breu
  • Volker AltstädtEmail author
Original Paper

Abstract

The mechanical properties of epoxy/clay nanocomposites were investigated in relation to the particle size and shear stiffness state of the dispersed nanoplatelets. The fracture toughness and the underlying toughening mechanisms were thoroughly discussed in detail. For this study, a highly pure synthetic fluorohectorite with large lateral extensions (≈3.8 µm) was used and compared to natural montmorillonite characterized by significantly smaller lateral extensions (≈400 nm). Moreover, for the synthetic fluorohectorite, the subtle balance between layer charge density and the hydration enthalpy of interlayer cations allows for switching between a shear-labile and shear-stiff state, something impossible for the natural material. To ensure optimum dispersion, solution blending was followed by three roll milling for nanocomposite preparation. The addition of all three types of clay used in this study provoked a decrease in glass transition temperature, which indicated a moderate interfacial strength. The maximum increase in fracture toughness and strain energy release rate was observed for the nanocomposites prepared with the large and shear-stiff fluorohectorites at a particle content as low as 2.2 vol%. Morphological investigations by scanning electron microscopy of the fracture surfaces revealed the contribution of several micro-mechanical toughening mechanisms. In contrast to the small natural montmorillonite, the large synthetic nanoplatelets promoted additional energy dissipating mechanisms such as crack deflection and crack pinning leading to an enhanced fracture toughness. These observations are discussed in details using fracture mechanical approaches.

Keywords

Fracture Toughness Energy Release Rate Neat Epoxy Crack Deflection Static Light Scattering 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors highly acknowledge the financial support from the German Research Foundation in the frame of the Collaborative Research Center SFB 840: “From particulate nanosystems to mesotechnology,” and from the German Federal Ministry for Economic Affairs and Energy (FKZ 0327895E).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Martin Heinz Kothmann
    • 1
  • Mazen Ziadeh
    • 2
  • Gökhan Bakis
    • 1
  • Agustin Rios de Anda
    • 1
    • 3
  • Josef Breu
    • 2
  • Volker Altstädt
    • 1
    Email author
  1. 1.Lehrstuhl für Polymere WerkstoffeUniversität BayreuthBayreuthGermany
  2. 2.Lehrstuhl für Anorganische Chemie IUniversität BayreuthBayreuthGermany
  3. 3.Centre de Recherche sur les Macromolécules Végétales (CERMAV), UPR 5301 CNRSSaint Martin d’HèresFrance

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