Synergistic effect of organic and inorganic nano fillers on the dielectric and mechanical properties of epoxy composites

doi:10.1016/j.jmst.2018.06.014

Abstract

Abstract:

Titanium oxide TiO₂/epoxy and TiO₂ with detonation nano-diamond (DND)/epoxy nanocomposites were prepared by using ultrasonication method. TiO₂ and DND particles as reinforcement species and epoxy as matrix were used to produce nanocomposites. The addition of DND particles into TiO₂/epoxy composite improved the dielectric and mechanical properties of nanocomposites in significant amount. The dielectric properties of TiO₂-DND/epoxy nanocomposite demonstrated increase in permittivity and conductivity after addition of the DND particles. The maximum and minimum reflection losses of TiO₂-DND/epoxy nanocomposite for 0.6 and 0.2 wt% DND loading were detected at -14.5 and -1.3 dB, respectively. The flexural and tensile strength of TiO₂-DND/epoxy nanocomposites with the addition of 0.4 wt% DNDs were enhanced to 220% and 223%, respectively. Additionally, the energy to break and percent break strain were 3.9 J and 3.86, respectively for 0.4 wt% DND loading in TiO₂-DND/epoxy nanocomposite. Therefore, the present work findings claim that DND particles are well suitable to enrich the dispersion of TiO₂ nanoparticles in epoxy matrix, which develops a strong load transfer interface between the nanoparticles and epoxy matrix and consequently leads to superior properties.

Key words: Epoxy nanocomposite, Dispersion, Mechanical and dielectric properties

Muhammad Khan, Aqeel A. Khurram, Tiehu Li, Tingkai Zhao, T. Subhani, I.H. Gul, Zafar Ali, Vivek Patel. Synergistic effect of organic and inorganic nano fillers on the dielectric and mechanical properties of epoxy composites[J]. J. Mater. Sci. Technol., 2018, 34(12): 2424-2430.

Figures/Tables 8

Fig. 1. TEM images of (a) TiO2 and (b) DND nanoparticles.

Fig. 2. XRD pattern of sample (III), sample (V) and sample (VIII).

Fig. 3. SEM micrographs of (a) TiO2, (b) DND, (c) blank epoxy, (d) 0.3 wt% TiO2/epoxy, (e) 0.1 wt% TiO2-DND/epoxy and (f) 0.6 wt% TiO2-DND/epoxy nanocomposites.

Fig. 4. Real and imaginary parts of complex permittivity of nanocomposites as a function of TiO2 and DND loading.

Fig. 5. Ac conductivity measurement as a function of the TiO2 and DND particles content in epoxy polymer.

Fig. 6. Reflection loss of the (5052) epoxy nanocomposites filled with different loading of TiO2 and DND particles.

Fig. 7. and DNDs (error bars represent ± standard deviations, n = 3).

Fig. 8. (a) Reveals energy to break and (b) showing percent break strain of epoxy nanocomposite filled with different amount of TiO2 and DND particles (error bars represent ± standard deviations, n = 3).

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