Wear dynamics of a TPU/steel contact under reciprocal sliding

Yahiaoui, Malik; Denape, Jean; Paris, Jean-Yves; Ural, Aydemir Güralp; Alcalà, Noelia; Martínez, Francisco

doi:10.1016/j.wear.2014.04.005

Cited by 44 publications

(23 citation statements)

References 25 publications

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“…Schallamach ridges) can appear on the worn surfaces as described by Schallamach concerning elastomers [5]. Several studies exposed the formation and propagation of Schallamach ridges in rubber-like polymers [6] and in thermoplastics with high thermomechanical properties (e.g thermoplastic polyurethane [7]).…”

Section: Introductionmentioning

confidence: 99%

Friction, acoustic emission, and wear mechanisms of a PEKK polymer

Yahiaoui

Chabert

Paris

et al. 2019

Tribology International

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The tribological behavior of a steel/PEKK ball-on-flat contact was studied regarding the load, the velocity and the sliding distance in reciprocating or unidirectional motion. The friction measurements were synchronized with an acoustic emission (AE) device. The results show a behavior change associated with an adiabatic effect on the polymer when the mechanical energy input increases. Two interfacial mechanisms are also characterized: Schallamarch ridges and longitudinal ploughings. These mechanisms are related to two AE frequencies of 0.2 MHz and 1 MHz. The discussion on these two AE populations brings a stronger analysis and completes the friction and the wear mechanisms results.

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Section: Introductionmentioning

confidence: 99%

Friction, acoustic emission, and wear mechanisms of a PEKK polymer

Yahiaoui

Chabert

Paris

et al. 2019

Tribology International

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“…DSC was used to investigate the presence of 5FU crystallites within the PU matrix and possible changes in the thermal properties of the PU after drug incorporation. The thermogram of pure 5FU revealed a sharp endothermic peak at 282 °C corresponding to its melting ( Tm ) and degradation temperatures ( Td ) ( Figure 6 ) [ 32 , 59 , 61 ], whereas the thermogram of PU film displayed a glass transition temperature ( Tg ) of ~106 °C, which is consistent with interactions between hard urethane segments [ 62 , 76 ]. In comparison, the thermogram of PU 5FU films revealed a small, sharp endothermic peak at 285 °C consistent with the 5FU Tm and a Tg at ~99 °C.…”

Section: Resultsmentioning

confidence: 99%

Development and In Vitro Evaluation of 5-Fluorouracil-Eluting Stents for the Treatment of Colorectal Cancer and Cancer-Related Obstruction

et al. 2020

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Self-expanding metal stents (SEMSs) are currently the gold standard for the localised management of malignant gastrointestinal (GI) stenosis and/or obstructions. Despite encouraging clinical success, in-stent restenosis caused by tumour growth is a significant challenge. Incorporating chemotherapeutic drugs into GI stents is an emerging strategy to provide localised and sustained release of drugs to intestinal malignant tissues to prevent tumour growth. Therefore, the aim of this work was to develop and evaluate a local GI stent-based delivery system that provides a controlled release of 5-fluorouracil (5FU) over a course of several weeks to months, for the treatment of colorectal cancer and cancer-related stenosis/obstructions. The 5FU-loaded GI stents were fabricated via sequential dip-coating of commercial GI stents with a drug-loaded polyurethane (PU) basecoat and a drug-free poly(ethylene-co-vinyl acetate) (PEVA) topcoat. For comparison, two types of commercial stents were investigated, including bare and silicone (Si) membrane-covered stents. The physicochemical properties of the 5FU-loaded stents were evaluated using photoacoustic Fourier-transform infrared (PA-FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and thermal analysis. In vitro release studies in biological medium revealed that the 5FU-loaded stents provided a sustained release of drug over the period studied (18 d), and cell viability, cell cycle distribution and apoptosis assays showed that the released 5FU had comparable anticancer activity against human colon cancer cells (HCT-116) to pure 5FU. This study demonstrates that dip-coating is a facile and reliable approach for fabricating drug-eluting stents (DESs) that are promising candidates for the treatment of GI obstructions and/or restenosis.

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“…It is well known that TPU provokes 'stick-slip phenomena' initiated by the critical values of the sliding speed and normal load. It is generally characterized by drops of acoustic emission energy and peaks of friction coefficient [27]. It is thought that the decrease in wear loss is related to this phenomenon and also the soft structure of the pure TPU.…”

Section: Resultsmentioning

confidence: 99%

Effect of different parameters on the tribological performance of polypropylene/thermoplastic polyurethane blends under dry sliding conditions

Savaş

2019

Bull Mater Sci

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In this study, polypropylene/thermoplastic polyurethane (PP/TPU) blends (weight ratios of 75/25 and 25/75) were produced by melt blending, and a maleic anhydride-grafted polypropylene (PP-g-MA) copolymer was used as a coupling agent. The effect of the concentration of the coupling agent (5-11 phr), TPU concentration (25-75%), normal load (2-4 N) and sliding velocity (60-72 rpm) on the wear properties of the blends were characterized through a pin-on-disc abrasive wear test. A 2 4 full-factorial experimental design was chosen to screen the significant factors and their interactions influencing the tribological performance of the blends. After the tests, the morphology of the worn surface of the samples was observed using scanning electron microscopy. Shore D hardness tests were also conducted and the relationships between these behaviours were analysed on the basis of the findings. According to the wear test results, the factors that have the greatest effect on the wear rates are as follows: normal load, TPU concentration, sliding velocity and PP-g-MA concentration, respectively. The wear rate of the blends increases by increasing the normal load, TPU concentration and sliding speed, and slightly decreases by increasing the PP-g-MA concentration. As expected, the wear and hardness results showed the apparent superiority of the PP 75 /TPU 25 blends over the PP 25 /TPU 75 blends, because of the higher content of rigid segments in the blends.

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Wear dynamics of a TPU/steel contact under reciprocal sliding

Cited by 44 publications

References 25 publications

Friction, acoustic emission, and wear mechanisms of a PEKK polymer

Friction, acoustic emission, and wear mechanisms of a PEKK polymer

Development and In Vitro Evaluation of 5-Fluorouracil-Eluting Stents for the Treatment of Colorectal Cancer and Cancer-Related Obstruction

Effect of different parameters on the tribological performance of polypropylene/thermoplastic polyurethane blends under dry sliding conditions

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