Premium
Tribological properties of composites of polyamide‐6 and nanotubes of Mo S 2 , and nanowires of Mo O (3− x ) and Mo 6 S 2 I 8
Author(s) -
Meier Johann G.,
Mrzel Aleš,
Canales Margarita,
Gonzalvo Pilar,
Alcala Noelia
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201329359
Subject(s) - materials science , composite material , tribology , nanowire , differential scanning calorimetry , crystallinity , polyamide , nanocomposite , carbon nanotube , polymer , tribometer , mechanical properties of carbon nanotubes , nanotube , nanotechnology , physics , thermodynamics
Composites of Mo 6 S 2 I 8 ‐nanowires, MoO (3− 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− 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.