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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

Title data

Kothmann, Martin ; Ziadeh, Mazen ; Bakis, Gökhan ; Rios de Anda, Agustin ; Breu, Josef ; Altstädt, Volker:
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.
In: Journal of Materials Science. Vol. 50 (July 2015) Issue 14 . - pp. 4845-4859.
ISSN 1573-4803
DOI: https://doi.org/10.1007/s10853-015-9028-7

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Fracture Toughness; Energy Release Rate; Neat Epoxy; Crack Deflection
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Faculties > Faculty of Engineering Science > Chair Polymer Engineering > Chair Polymer Engineering - Univ.-Prof. Dr.-Ing. Volker Altstädt
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 3
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Polymer Engineering
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 29 Mar 2018 07:41
Last Modified: 29 Mar 2018 07:41
URI: https://eref.uni-bayreuth.de/id/eprint/43143