Mechanical and tribological properties of carbon nanotube reinforced polypropylene composites

Mertens, A. Johnney; Senthilvelan, S.

doi:10.1177/1464420716642620

Cited by 23 publications

(33 citation statements)

References 35 publications

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“…In the second stage, called as steady-state, the friction coefficient of the PA 66 and PA 66 composites reached a steady value after about 600m sliding distance. Similar results were obtained by Horovistiz [3], Autay [9], Zhou [8], Li [27] and Mertens [28]. Mertens [28] stated that the coefficient of friction has become stable after 500 s. It is stated that this behavior is due to the non-uniform contact between the pin and the counter disc surface.…”

Section: Methodssupporting

confidence: 76%

“…Similar results were obtained by Horovistiz [3], Autay [9], Zhou [8], Li [27] and Mertens [28]. Mertens [28] stated that the coefficient of friction has become stable after 500 s. It is stated that this behavior is due to the non-uniform contact between the pin and the counter disc surface. After 500s, it is stated that the contact between pin and disc surface becomes uniform and therefore the coefficient of friction passes to the steady-state stage.…”

Section: Methodssupporting

confidence: 76%

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Tribological properties of carbon fiber and multi-walled carbon nanotube filled polyamide 66 composites

Ozsarikaya¹,

Yetgin²,

Ünal³

2019

BALTTRIB

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In this study, the synergistic effect of multi-walled carbon nanotube on the tribological performance of carbon fiber reinforced polyamide 66 (PA66) polymer composite has been studied. Unfilled polyamide 66, 30wt.% carbon fiber reinforced PA66 (PA66/30CF) composite and small amount of (0.5wt.%) multi-walled carbon nanotube (MWCNT) reinforced PA66/30CF (PA66/30CF/0.5MWCNT) composite were examined. Composite materials were compounded in a twin screw extruder. Tribological test samples were molded by an injection molding machine. Tribological tests were carried out under dry sliding conditions using a pin-on-disc wear test machine under the loads of 20, 30 and 40N at sliding speeds of 0.4, 0.8 and 1.2 m s-1. As a result of the study, it was determined that the friction coefficient and wear rate increased with the increment of load and sliding speed but both the coefficient of friction and wear rate decreased with the addition of CF and MWCNT to the polyamide 66 polymer.

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Section: Methodssupporting

confidence: 76%

Section: Methodssupporting

confidence: 76%

Tribological properties of carbon fiber and multi-walled carbon nanotube filled polyamide 66 composites

Ozsarikaya¹,

Yetgin²,

Ünal³

2019

BALTTRIB

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“…Polypropylene (PP) is one of the most versatile thermoplastics used for manufacturing of a variety of products due to its unique features and qualities, including good processability, high tensile strength, low density, high resistance to corrosion, chemical stability, and high impermeability [ 27 , 28 , 29 , 30 , 31 , 32 ]. Moreover, PP/CNT nanocomposites have received extensive attention in the last years.…”

Section: Introductionmentioning

confidence: 99%

Thermal, Rheological, Mechanical, and Electrical Properties of Polypropylene/Multi-Walled Carbon Nanotube Nanocomposites

et al. 2021

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In this paper, nanocomposites based on polypropylene (PP) filled with up to 5 wt.% of multi-walled carbon nanotubes (MWCNTs) were investigated for determining the material property data used in numerical simulation of manufacturing processes such as the injection molding and extrusion. PP/MWCNT nanocomposite pellets were characterized for rheological behavior, crystallinity, specific volume and thermal conductivity, while injection-molded samples were characterized for mechanical and electrical properties. The addition of MWCNTs does not significantly change the melting and crystallization behavior of the PP/MWCNT nanocomposites. The effect of MWCNTs on melt shear viscosity is more pronounced at low shear rates and MWCNT loadings of 1–5 wt.%. However, with the addition of up to 5 wt.% of MWCNTs, the PP/MWCNT nanocomposite still behaves like a non-Newtonian fluid. The specific volume of the PP/MWCNT nanocomposites decreases with increasing MWCNT loading, especially in the MWCNT range of 1–5 wt.%, indicating better dimensional stability. The thermal conductivity, depending on the pressure, MWCNT wt.% and temperature, did not exceed 0.35 W/m·K. The PP/MWCNT nanocomposite is electrical non-conductive up to 3 wt.%, whereas after the percolating path is created, the nanocomposite with 5 wt.% becomes semi-conductive with an electrical conductivity of 10−1 S/m. The tensile modulus, tensile strength and stress at break increase with increasing MWCNT loading, whereas the elongation at break significantly decreases with increasing MWCNT loading. The Cross and modified 2-domain Tait models are suitable for predicting the melt shear viscosity and specific volume as a function of MWCNTs, respectively. These results enable users to integrate the PP/MWCNT nanocomposites into computer aided engineering analysis.

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“…The addition of CNTs increased the material strength, modulus and thermal conductivity. Detail mechanical and tribological properties of unreinforced and various CNT-PP composites (0.5-5 wt%) have been reported elsewhere 29. Among the materials tested, 1 wt% CNT-PP composite exhibited the least frictional resistance and maximum wear resistance.…”

mentioning

confidence: 61%

Surface durability of injection-moulded carbon nanotube–polypropylene spur gears

Mertens

Senthilvelan

2016

Proceedings of the Institution of Mechanical Engineers, Part L:

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Short fibre reinforced thermoplastics are being considered for light-and medium-duty engineering applications because of their improved mechanical strength combined with cost-effective advantages. In recent years, the carbon nanotube reinforced thermoplastics are being preferred over the short fibre reinforced thermoplastics because of the absence of directional shrinkage characteristics, directional mechanical and tribological properties. In this work, 1 wt% carbon nanotube-polypropylene material was injection-moulded to spur gears and evaluated for the durability using in-house developed power absorption gear test rig. During testing, the net surface temperature of the test gears and in-line torque available at the driver and driven shafts were continuously measured. The measured torque was used to evaluate the transmission efficiency of the test-steel gear pair. The measured net surface temperature was correlated with the gear failure mode. Test gears were run up to failure or up to 8.6 Â 10 5 cycles, whichever occurred first. Worn-out gear tooth surfaces were observed using an optical and scanning electron microscope to understand the wear mechanism. In the initial stage of service, test gears exhibited less wear near the pitch region compared to the tip and root regions. This behaviour is due to the maximum sliding velocities at the tip and root regions compared to the pitch region. The carbon nanotube-polypropylene gears exhibited lower surface temperature (5À10 C), improved service life (30%À80%) and higher transmission efficiency (1À1.5%) compared to the polypropylene gear.

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Mechanical and tribological properties of carbon nanotube reinforced polypropylene composites

Cited by 23 publications

References 35 publications

Tribological properties of carbon fiber and multi-walled carbon nanotube filled polyamide 66 composites

Tribological properties of carbon fiber and multi-walled carbon nanotube filled polyamide 66 composites

Thermal, Rheological, Mechanical, and Electrical Properties of Polypropylene/Multi-Walled Carbon Nanotube Nanocomposites

Surface durability of injection-moulded carbon nanotube–polypropylene spur gears

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