Structural, thermal, and tribological properties of intercalated polyoxymethylene/molybdenum disulfide nanocomposites

Abstract

Intercalated polyoxymethylene (POM)/molybdenum disulfide (MoS 2 ) nanocomposites were prepared by in situ intercalation/polymerization. The structures of the composites were characterized by means of powder X-ray diffraction (XRD) and transmission electron microscopy. The XRD pattern showed that the polymer was inserted into the MoS 2 galleries. The interlayer spacing of the intercalated phase increased from 6.15 to 11.18 Å . The thermal behavior of the composites was also investigated through thermogravimetric analysis. The results show that the heat resistance of the intercalated composites decreased slightly. The tribological behavior of POM/MoS 2 was investigated on an MQ-800 end-face tirbometer under dry friction. The worn surfaces were observed by scanning electron microscopy. The results show that POM/MoS 2 presented better friction reduction and wear resistance, especially under high load. The friction mechanism of the nanocomposites is also discussed in association with X-ray photoelectron spectroscopy.

Effect of the type, size and concentration of solid lubricants on the tribological properties of the polymer PEEK

“…This can also be achieved by using appropriate self-lubricating particles, such as molybdenum disulphide (MoS₂) and tungsten disulphide (WS₂). These two solid lubricants are well known for their lowfriction properties and wear resistance [8][9][10][11], but they have not yet been extensively used in polymer composites, especially in combination with PEEK.…”

Nanocomposites of Polyoxymethylene

“…Th e in situ cationic ring-opening copolymerization of the monomers trioxane and dioxolane (5.0 wt%) in the presence of MoS 2 layers was also reported [9]. Reaction proceeded at 65 ºC in non-polar cyclohexane, with the boron trifl uoride etherate used as the catalyst, and water as the cocatalyst.…”

“…14.20(b). Th e comparison of tribological performance of melt-blended and in situ polymerized intercalative POM-MoS 2 nanocomposites indicated that the latter presented better friction reduction and wear resistance, especially under high load, while the heat resistance was only slightly decreased [9]. Th e counterpart steel surface, which rubbed against the POM/MoS 2 nanocomposites, was examined by means of XPS method.…”

The Effects of Copper and Polytetrafluoroethylene (PTFE) on Thermal Conductivity and Tribological Behavior of Polyoxymethylene (POM) Composites

“…Various fillers or fibers, such as graphite, polytetrafluoroethylene (PTFE), MoS 2 , Al 2 O 3 , glass fibers, and carbon fibers, have been incorporated into the POM matrix as internal lubricants or reinforcements to further enhance the tribological properties of POM composites. [5][6][7][8][9] Wang et al, [10] for instance, prepared intercalated POM-MoS 2 nanocomposites by in situ intercalation polymerization and found that the intercalated composites presented better friction reduction and wear resistance, especially under high load, and the heat resistance of the composites decreased only slightly as compared to pure POM. Wang et al [11] also found that POM-ZrO 2 nanocomposites exhibited better wear resistance and the friction coefficient of the nanocomposites was changed only slightly.…”