Tribological Properties of Polyamide 46/Graphene Nanocomposites

Abstract

Polyamide 46 (PA46) is used in various automotive parts because of its excellent heat resistance and mechanical properties. This study aims to improve the frictional properties of PA46 using the lubricating ability of graphene. Nanocomposites are prepared via two mixing methods: Graphene powder is compounded directly with PA46 pellets through a twin-screw extruder, or PA46 powder is added to graphene dispersion for self-adsorption, and subsequently, it is dried and compounded with PA46 through the twin-screw extruder. Application of the nanocomposite in the friction field is evaluated via the pin-on-disk method. The coefficient of friction of the nanocomposite prepared by self-adsorption is lower than that of the nanocomposite prepared by direct compounding. The mechanical properties of the nanocomposite fabricated by self-adsorption are superior to those of other materials. This can be attributed to the uniform dispersion of graphene and the strong attractive force between the PA46 matrix and graphene.

Hygroscopic Behavior of Polypropylene Nanocomposites Filled with Graphene Functionalized by Alkylated Chains

“…Graphene oxide was produced using the method presented in [ 13 , 21 ] (described below), after which graphene functionalized with a linear alkyl group (CMG-R) was synthesized through a surface alkylation reaction using three types of alkylamines: octan-1-amine (CMG-R1, eight hydrocarbons per length of a linear alkyl chain), decan-1-amine (CMG-R2, 10 hydrocarbons), and octadecane-1-amine (CMG-R3, 18 hydrocarbons). The designed alkylated CMG (CMG-R) was able to interact with the alkyl chain of PP at the molecular level.…”

“…The precipitate was washed at least three times in a mixed solution of DI water (2000 mL), 30% HCl (2000 mL), and ethanol (2000 mL) to obtain an aqueous graphite oxide solution. Finally, the 2 g/L aqueous graphite oxide solution was subjected to ultrasonic treatment using an ultrasonic homogenizer for more than 6 h to obtain a graphene oxide (GO) aqueous solution [ 13 ].…”

“…It has remarkable properties such as excellent electrical conductivity, thermal properties, mechanical strength, moisture barrier properties, and wear resistance. Owing to these advantages, it is employed in various industries [ 9 , 10 , 11 , 12 , 13 ].…”

Reducing Moisture Absorption in Polypropylene Nanocomposites for Automotive Headlamps Using Hydrophobicity-Modified Graphene/Montmorillonite

“…Second, positively charged graphene (CMG + ) capable of forming chemical interactions with the cationic nitrogen (N + ) of organo-MMT was produced. For CMG + , GO was prepared using an improved method [18] reported previously [17,19]. Subsequently, a CMG + colloid with high dispersibility was prepared with 4,4-oxidianiline.…”

“…Figure 3 shows the zeta potential analysis results for CMG + and organo-MMT. The sign and magnitude of the zeta potential provide information regarding the surface charge of a particle [19]. As shown in Figure 3, CMG + has a strong surface positive charge (+60.2 mV) and, hence, adsorbs to organo-MMT (−35.0 mV), which has a negative charge on the silicate surface, via electrostatic self-assembly.…”