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Evgeni Ivanov, Hristiana Velichkova, Rumiana Kotsilkova, Silvia Bistarelli, Antonino Cataldo, Federico Micciulla, Stefano Bellucci
Rheological behavior of graphene/epoxy nanodispersions
Appl. Rheol. 27:2 (2017) 24469 (9 pages)
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Graphene/polymer nanocomposites are the latest trends in materials science in the recent years, but the technology of their
preparation plays a crucial role in obtaining reliable materials with repeatable and enhanced properties. Up to now, there are
many unresolved problems in controlling the dispersion of the graphene filler and the corresponding influence on the properties
of the final nanocomposite materials. In the present study, we apply rheological methods for controlling the quality of
the graphene dispersion. We prepare and characterize epoxy/graphene nanodispersions with graphene contents varying from
0.05 to 1 wt% and explore the effect of different mixing regimes on the dynamic moduli and viscosity, thus assessing the
degree of the dispersion. The rheological percolation threshold and relaxation time spectra are determined, in order to evaluate
the internal structure of the nanodispersions. The relaxation spectrum is highly efficient to probe the effects of interfaces and
interconnections on the relaxation dynamics of molecules in nanodispersions. Rheological results combined with transmission
electron microscopy (TEM) observations confirm that the low frequency dynamic viscosity and moduli strongly increase, with
increasing the degree of dispersion due to the exfoliation of graphene sheets. The rheological percolation threshold was found
at very low concentration depending from the processing conditions. The weight of the relaxation spectra is strongly shifted
to higher values, compared to the neat epoxy resin and this effect is much stronger around and above the rheological percolation
threshold.
► Cite this publication as follows:
Ivanov E, Velichkova H, Kotsilkova R, Bistarelli S, Cataldo A, Micciulla F, Bellucci S: Rheological behavior of graphene/epoxy nanodispersions, Appl. Rheol. 27 (2017) 24469.
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