The Effect of Crosslinks on the Sliding Wear of High-Density Polyethylene
| Autor: | Walter Roberto Tuckart, Marcelo Daniel Failla, Erica Cintia Molinari |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Organic peroxide Materials science Mechanical Engineering Abrasive technology industry and agriculture macromolecular substances 02 engineering and technology Surfaces and Interfaces Polymer Tribology 021001 nanoscience & nanotechnology Indentation hardness Surfaces Coatings and Films Linear low-density polyethylene chemistry.chemical_compound Crystallinity 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials High-density polyethylene Composite material 0210 nano-technology human activities |
| Zdroj: | Tribology Letters. 64 |
| ISSN: | 1573-2711 1023-8883 |
| DOI: | 10.1007/s11249-016-0763-y |
| Popis: | The purpose of this study was to determinate the influence of the molecular crosslinking in the wear resistance of a linear polyethylene (PE) sliding against a rough steel surface. A set of PEs with different degrees of crosslinks were obtained by chemical modification of a PE with varying concentrations of organic peroxide. The amount of gel, molecular weight between crosslinks (M c), crystallinity and Vickers microhardness were determined in the crosslinked PE’s. The tribological performance of the materials was evaluated under dry sliding conditions using a block-on-ring tester. The coefficient of friction and the wear rate were determined in experiments in which a sample of polymer was contacted with the peripheral surface of a steel ring rotating at constant velocity. The wear resistance of the crosslinked materials increases with the amount of gel and when M c decreases. The crosslinked PE showed a wear rate lower than the original PE when the amount of gel was larger than 80 % of the total mass. The coefficient of friction of the PE and crosslinked material was about 0.2 regardless of the normal load applied. The analysis of the worn surfaces by optical and SEM microscopy reveals that the primary mechanism involved in wear is abrasive wear. |
| Databáze: | OpenAIRE |
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