System temperature and tribological behaviour of polymer-metal sliding couples in pin-on-disc model testing

Uetz, H.; Richter, Kathrin S.; Wiedemeyer, J.

doi:10.1016/0043-1648(83)90316-2

Cited by 7 publications

(2 citation statements)

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“…The kinetic friction between polymers and metal surfaces is a relatively old topic and generally the frictional forces are ascribed to both adhesive and visco-elastic considerations. [18][19][20][21][22][23][24][25][26][27][28][29] While many of these studies consider temperature-dependent effects, only a small number probe the temperature region in the immediate vicinity of melting points [19][20][21]24,[29][30][31][32] while some examine the vicinity of other thermal transitions, such as the segmental α relaxation, signifying (T g ). 25,33,34 The region near the melting point was examined by Vinogradov et al in 1967 for ball-on-disc frictional measurements of HDPE, iPP, and their blends.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20][21][22][23][24][25][26][27][28][29] While many of these studies consider temperature-dependent effects, only a small number probe the temperature region in the immediate vicinity of melting points [19][20][21]24,[29][30][31][32] while some examine the vicinity of other thermal transitions, such as the segmental α relaxation, signifying (T g ). 25,33,34 The region near the melting point was examined by Vinogradov et al in 1967 for ball-on-disc frictional measurements of HDPE, iPP, and their blends. They found strong increases in the frictional force near the melting point, and they correlated this with strong decreases in modulus.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of kinetic friction: A handle for plastics sortation?

Thomas,

Snyder,

Migler

2024

Polymer Engineering & Sci

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Sortation is a crucial step in the mechanical recycling of post‐consumer plastics (PCR) whereby properties such as density or spectral signature are used to separate plastics. However, it is difficult to sort polyolefin flakes at high throughput by these properties. We ask whether the frictional properties of plastics as a function of temperature may be used as an alternate sorting property. However, fundamental studies of friction at temperatures near their melting points are limited. Here we measure the temperature dependence of kinetic friction for three common polyolefins (high and low‐density polyethylene and polypropylene) as well as polyethylene terephthalate (PET), focusing on the softening/melting regime. The results are augmented by differential scanning calorimetry and temperature‐dependence measurements of both dynamic modulus and probe tack. For the polyolefins, we find strong increases in the coefficients of kinetic friction during temperature ramps in the melting/softening regime. For the PET, we report a notable peak in the kinetic friction which we associate with the glass transition and cold‐crystallization. We discuss the enhanced friction in the context of rubber friction, which exhibits comparable coefficients of kinetic frictions.Highlights Significant upturn in kinetic friction coefficient of polyolefins near melting point Strong peak in kinetic friction coefficient of polyethylene terephthalate (PET) above glass transition Correlation of upturns with thermal and mechanical properties and tack High friction state is analogous to rubber friction High friction state is a possible mechanism for plastics sortation.

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