Characterization of mechanical properties of epoxy/nanohybrid composites by nanoindentation

Abstract

<jats:title>Abstract</jats:title><jats:p>The carbon nanofibers and molybdenum disulfide (CNF-MoS<jats:sub>2</jats:sub>) nanohybrid material was fabricated and incorporated into epoxy resin to form the nanocomposite coating. Firstly, microstructure observation shows that each CNF was uniformly wrapped up with MoS<jats:sub>2</jats:sub> nanosheets, and the nanohybrids were well dispersed in the coating. Then, nanoindentation experiments were carried out to explore the effect of the CNF-MoS<jats:sub>2</jats:sub> nanohybrids on the mechanical properties of the epoxy resin coating. The results demonstrate that elastic modulus, hardness and creep deformation resistance of the CNF-MoS<jats:sub>2</jats:sub> epoxy resin coating are greatly increased in comparison with both pure epoxy resin and MoS<jats:sub>2</jats:sub> epoxy resin coatings. Finally, the underlying mechanism of high-performance tribological behavior of the nanocomposites is analyzed accordingly. It can be concluded that the wrapped structure with MoS<jats:sub>2</jats:sub> sheets growing on the surface of CNF increases the contact area and reduces the friction coefficient of the composite coating, while the wear resistance of the nanocomposite coating is also greatly improved due to the superior high hardness of CNF.</jats:p>

The effect of different grafting extent of PBO‐MoS2 hybrids on the tribological performance of TPI‐based composites at high temperatures

“…In unloading stage, relative to the other three curves, the TPI‐6 had lower residual depth (~448 nm), the main reason was that it was more elastic 25 . The incorporation of the PBO‐MoS 2 hybrids in TPI matrix can form a three‐dimensional structure, When the composites suffered the load from the indenter, because of the hybrids had better dispersity and larger specific surface area, it would share part of the stresses, resulting to the reduced pressure on polymer matrix, then the bearing capacity, hardness and elastic modulus of composites would be improved 26 . The composites with higher hardness can have better bearing capacity and prevent the polymer matrix from being worn off.…”

Study of Nano-Mechanical Performance of Pretreated Natural Fiber in LDPE Composite for Packaging Applications

“…An indenter in the nanoindenter, controlled by a high-resolution instrument, penetrates the surface of the material with a certain rate and afterward unloaded. Hardness and modulus were calculated using load-displacement data obtained through loading-unloading cycles [21]. In 2007, Lee et al measured the hardness and modulus of the fiber-reinforced polymeric composite [21].…”

“…Hardness and modulus were calculated using load-displacement data obtained through loading-unloading cycles [21]. In 2007, Lee et al measured the hardness and modulus of the fiber-reinforced polymeric composite [21]. In 2017, Kavouras et al explored the effect of microstructure on the fiber-based composite using nanoindentation.…”

“…The service life of the biocomposite is significantly affected by the creep characteristic of the constituent particles. Tehrani et al determined the time-dependent behavior of epoxy nanocomposites through nanoindentation [21]. Mechanical properties of polychloroprene composites based on flax fiber were also reported [7].…”

Supramolecular ionic polymer/carbon nanotube composite hydrogels with enhanced electromechanical performance

“…Development of novel composite materials is important for improving the material performance [17][18][19]. For instance, carbon nanomaterials have been widely used as a functional additive in polymers to improve the mechanical, electrical, and thermal properties of nanocomposites [20][21][22][23]. Recently, reports have indicated that the mechanical strength and electro-response characteristics of EAHs could be improved by adding electro-active components, such as graphene [24] and multi-walled carbon nanotubes (MWCNTs) [25], to the polymer matrix.…”