UHMWPE/CaSiO3 Nanocomposite: Mechanical and Tribological Properties

Danilova, S. N.; Yarusova, S. B.; Kulchin, Yuri N.; Жевтун, И. Г.; Buravlev, I. Yu.; Охлопкова, А. А.; Гордиенко, П. С.; Субботин, Е. П.

doi:10.3390/polym13040570

Cited by 36 publications

(33 citation statements)

References 61 publications

(60 reference statements)

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“…In addition, the discussion of wear-related results was carried out in terms of the formation of secondary structures on the friction surfaces of polymers and composites. The latter were formed from both debris and oxidized particles of the counterpart materials [ 34 ]. In these studies, the analysis of micrographs of the friction/wear surfaces of all studied samples and counterparts was carried out according to the same principle.…”

Section: Resultsmentioning

confidence: 99%

Experimental—FEM Study on Effect of Tribological Load Conditions on Wear Resistance of Three-Component High-Strength Solid-Lubricant PI-Based Composites

et al. 2021

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The structure, mechanical and tribological properties of the polyimide-based composites reinforced with chopped carbon fibers (CCF) and loaded with solid-lubricant commercially available fillers of various natures were investigated. The metal- and ceramic counterparts were employed for tribological testing. Micron sized powders of PTFE, colloidal graphite and molybdenum disulfide were used for solid lubrication. It was shown that elastic modulus was enhanced by up to 2.5 times, while ultimate tensile strength was increased by up 1.5 times. The scheme and tribological loading conditions exerted the great effect on wear resistance of the composites. In the tribological tests by the ‘pin-on-disk’ scheme, wear rate decreased down to ~290 times for the metal-polymer tribological contact and to ~285 times for the ceramic-polymer one (compared to those for neat PI). In the tribological tests against the rougher counterpart (Ra~0.2 μm, the ‘block-on-ring’ scheme) three-component composites with both graphite and MoS2 exhibited high wear resistance. Under the “block-on-ring” scheme, the possibility of the transfer film formation was minimized, since the large-area counterpart slid against the ‘non-renewable’ surface of the polymer composite (at a ‘shortage’ of solid lubricant particles). On the other hand, graphite and MoS2 particles served as reinforcing inclusions. Finally, numerical simulation of the tribological test according to the ‘block-on-ring’ scheme was carried out. Within the framework of the implemented model, the counterpart roughness level exerted the significantly greater effect on wear rate in contrast to the porosity.

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Section: Resultsmentioning

confidence: 99%

Experimental—FEM Study on Effect of Tribological Load Conditions on Wear Resistance of Three-Component High-Strength Solid-Lubricant PI-Based Composites

et al. 2021

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“…Figure 5 b exhibits the infrared spectra of the UHMWPE samples processed with various residence time at 180 °C. The peak at around 1720 cm −1 , attributed to the carbonyl peak from the oxidative degradation, cannot be detected with the increasing residence time of the extruded samples, indicating less oxidation occurs during such processing [ 22 ]. All the above results indicate that the extremely low thermal oxidative degradation occurs with the increase of residence time.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Chain Mobility of Ultrahigh Molecular Weight Polyethylene by Regulating Residence Time under a Consecutive Elongational Flow for Improved Processability

et al. 2021

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Improving the processability of ultrahigh molecular weight polyethylene (UHMWPE) and understanding the effect of the polymeric chain mobility has long been a challenging task. Herein, we show that UHMWPE without any processing aids can be processed at a lower temperature of 180 °C compared to conventional processing temperatures (~250 °C) under a continuous elongational flow (CEF) by using an eccentric rotor extruder (ERE). By probing the effect of the residence time of UHMWPE samples under a CEF on the morphology, rheological behavior and molecular orientation, we find that the long polymer chains of UHMWPE are apt to orientate under a consecutive volume elongational deformation, thereby leading to a higher residual stress for the extruded sample. Meanwhile, the residence time of samples can regulate the polymeric chain mobility, giving rise to the simultaneous decrease of the melting defects and residual stress as well as Hermans orientation function with increasing residence time from 0 to 60 s. This also engenders the enhanced diffusion of UHMWPE segments, resulting in a defect-free morphology and higher entanglement with lower crystallinity but without causing obvious thermal oxidative degradation of UHMWPE. This interesting result could originate from the fast chain entanglement and particle welding enabled by a desirably short residence time, which could be explained by the empirical, entropy-driven melting explosion mechanism.

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“…In a recent study, UHMWPE was incorporated with wollastonite (calcium silicate) to improve wear resistance [ 100 ]. UHMWPE nanocomposites achieved at most six times lower WR at 1 wt.% wollastonite content.…”

Section: Tribological Performance Of Polymer Nanocompositesmentioning

confidence: 99%

Effect of Nanofillers on Tribological Properties of Polymer Nanocomposites: A Review on Recent Development

et al. 2021

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Polymer nanocomposites with enhanced performances are becoming a trend in the current research field, overcoming the limitations of bulk polymer and meeting the demands of market and society in tribological applications. Polytetrafluoroethylene, poly(ether ether ketone) and ultrahigh molecular weight polyethylene are the most popular polymers in recent research on tribology. Current work comprehensively reviews recent advancements of polymer nanocomposites in tribology. The influence of different types of nanofiller, such as carbon-based nanofiller, silicon-based nanofiller, metal oxide nanofiller and hybrid nanofiller, on the tribological performance of thermoplastic and thermoset nanocomposites is discussed. Since the tribological properties of polymer nanocomposites are not intrinsic but are dependent on sliding conditions, direct comparison between different types of nanofiller or the same nanofiller of different morphologies and structures is not feasible. Friction and wear rate are normalized to indicate relative improvement by different fillers. Emphasis is given to the effect of nanofiller content and surface modification of nanofillers on friction, wear resistance, wear mechanism and transfer film formation of its nanocomposites. Limitations from the previous works are addressed and future research on tribology of polymer nanocomposites is proposed.

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UHMWPE/CaSiO3 Nanocomposite: Mechanical and Tribological Properties

Cited by 36 publications

References 61 publications

Experimental—FEM Study on Effect of Tribological Load Conditions on Wear Resistance of Three-Component High-Strength Solid-Lubricant PI-Based Composites

Experimental—FEM Study on Effect of Tribological Load Conditions on Wear Resistance of Three-Component High-Strength Solid-Lubricant PI-Based Composites

Enhancing Chain Mobility of Ultrahigh Molecular Weight Polyethylene by Regulating Residence Time under a Consecutive Elongational Flow for Improved Processability

Effect of Nanofillers on Tribological Properties of Polymer Nanocomposites: A Review on Recent Development

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