Tribological properties of composites of polyamide-6 and nanotubes of MoS₂, and nanowires of MoO_(3−x)and Mo₆S₂I₈

Abstract

Phone: þ34 976 01 1875, Fax: þ34 976 01 1888Composites of Mo 6 S 2 I 8 -nanowires, MoO (3 À x) -nanowires and MoS 2 -nanotubes with polyamide 6 (PA6) have been prepared in different concentrations up to 4% via melt-mixing using a laboratory twin screw extruder in order to investigate their tribological, mechanical and thermal properties. Chemical and structural composition of these nanowires and nanotubes with similar morphologies seem to play an important role in properties of fabricated polymer composites. Tribological tests were performed on the macroscale using a pin-on-disc (POD) tribometer and the thermal properties of the polymer nanocomposites were measured by differential scanning calorimetry to determine their glass transition temperatures and the levels of crystallinity. The behaviour of the nanowires (Mo 6 S 2 I 8 and MoO (3 À x) ) is different from the nanotubes (MoS 2 ) with respect to the induced effects on the friction coefficient and wear rate in function of concentration. The composites with the nanowires show a significant increase of the E-module of up to 38% at a nanowire concentration of 4 wt% in the glassy state of PA6, estimated from hardness measurements. The reduced friction coefficient and wear rates are related to the increased bulk shear strength of the nanowire polymer composites. In contrasts, nanotubes of MoS 2 did not show this strong reinforcement. The reduced friction coefficients and wear rates of the polymer composites with MoS 2 -nanotubes are predominantly related to the lubricating effect of the MoS 2 -nanotubes at the contact points.

Solving the “MoS2 Nanotubes” Synthetic Enigma and Elucidating the Route for Their Catalyst-Free and Scalable Production

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Structural, optical, and mechanical properties of cobalt copper oxide coatings synthesized from low concentrations of sol-gel process

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Composites of Inorganic Nanotubes and Polymers

“…The different improvements in the coeffi cient of friction obtained are a function of the shape of the WS 2 particle as well as WS 2 concentration and the experimental conditions employed. In the next contribution, Meier and co-workers report the tribological behaviour of composites of polyamide-6 (PA-6) with Mo 6 S 2 I 8 -nanowires, MoO (3-x) -nanowires and MoS 2 -INTs at different concentrations [8].…”