A study on the influence of reduced graphene oxide on the mechanical, dynamic mechanical and tribological properties of silicone rubber nanocomposites

Abstract

Graphene oxide (GO) was synthesized by modified Hummer’s method and it reduced with hydrazine. Synthesized reduced graphene oxide (rGO) was characterized by FT-IR spectroscopy, X-ray diffraction spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. An elastomeric nanocomposite was prepared by incorporating rGO in silicone rubber using two roll mill mixing method.Tribological study was conducted at a wear surface of hardened ground steel against different applied load, sliding speed and temperature using a pin on disk setup. Addition of rGO results in an improvement of mechanical, tribological and thermal properties of silicone rubber. The coefficient friction (COF) and specific wear rate of the nanocomposite decreased with rGO concentration, applied load, and temperature. Morphological analysis of SRrGO nanocomposites was deeply investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). Worn surface analysis confirms that rGO forms a lubricant film on the counter surface but it fails to form a strong adhesive film on the metal surface. The depth wear rate decreased by the incorporation of rGO in the Silicone rubber (SR) matrix.

Tribological performance of ionic liquid modified graphene oxide/silicone rubber composite and the correlation of properties using machine learning methods

“…It was primarily due to the development of a lubricant film, which smoothens the material that comes into contact with the metal surface, as well as the frictional heat produced. [ 14,32,33 ]…”

“…In a vacuum oven, it was dried at 80 C for 24 h. The remaining modified ILGO with 1.0, 1.5, 2.0, and 2.5 g of IL were made using the same process. [14] T A B L E…”

“…It was primarily due to the development of a lubricant film, which smoothens the material that comes into contact with the metal surface, as well as the frictional heat produced. [14,32,33] As applied load increases, the frictional heat produced during sliding in the contact area increases. The coefficient of friction was predicted for loads of 20 N and 30 N, as shown in Figure 8C.…”

“…[12] Graphene is used in different areas such as sensor, water sensitive shape memory material, tribology, multi-functional behavior. [13][14][15] The work in this arena generally concerns itself with surface modification of GO to enhance the compatibility with the compound matrix. More recent work in this area extends the methods by using, Ionic liquid (IL) to modify the GO surface to obtain better dispersion in the matrix.…”

Silane-functionalized graphene nanoplatelets for silicone rubber nanocomposites

“…Graphene nanoplatelets (GNPs), consisting of multiple layers of graphene, with thicknesses ranging from that of graphene to approximately 100 nm, have attracted attention as an economically viable alternative to graphene in large-scale applications [7]. Both graphene, usually in the form of graphene oxide (GO), and GNPs have been studied as reinforcing fillers to improve the mechanical properties and thermal conductivity of the silicone rubber composites [8][9][10][11][12][13]. The overall reinforcement of these grapheme-based materials to the SR matrix depends significantly on its dispersion level as well as the interfacial adhesion between filler and matrix [12,14,15].…”