Nanomechanic Properties of Polymer-Based Nanocomposites with Nanosilica by Nanoindentation

Abstract

The nanocomposites consist of nanometer silica fillers embedded in thermoset polymers, which were prepared by means of irradiation of ultraviolet light. The nanomechanic properties had been investigated by load–displacement analysis from nanoindentation experiments. The results obtained showed that the nanoindentation hardness is decreasing and tends to a certain value with increasing indentation depth, the value is among 1.91–4.11 GPa while the nanosilica contents varied from 0 to 5% within nanocomposites. Young’s modulus measured by nanoindentation is higher than the value by tensile test, namely EI = ET 1/4 2: 63 and the enhancement of Young’s modulus due to the presence of nanosilica with the above contents, EI = EI, 0 1/4 1: 7 2: 0 from 1: 8 2: 2 from tensile test, was compared to be consistent with each other in two different methods. So nanoindentation technique has been successfully applied for the valuation of the nanomechanic properties of nanocomposites with nanosilica.

Hydroxyapatite nanoparticle loaded collagen fiber composites: Microarchitecture and nanoindentation study

“…The ''creep-zone'' (a region between the loading-unloading curves) was observed in all experiments for exception of pure HA nanoparticle compact. Such dependences are typical in nanoindentation studies of polymeric materials, 38,39 and are associated with several viscoelastic effects that make the correct estimate of the mechanical properties quite complicated. For example, the pile-up effect 39 and surface roughness lead to higher values of Young's modulus at small penetration depths.…”

Hybrid materials obtained by in situ polymerization based on polypropylene and mesoporous SBA-15 silica particles: Catalytic aspects, crystalline details and mechanical behavior

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