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Authors
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Hoffmann, T. ; Lehmann, D.
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Title
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Chemical modification of poly(tetrafluoroethylene) micropowder - basis for special lubricant additives
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Date
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29.10.2012
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Number
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33763
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Abstract
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This contribution presents results of the chemical coupling reaction between the poly(tetrafluoroethylene) (PTFE) micropowder and oils. For the preparation of such dispersions, the reaction between the perfluoroalkyl(peroxy) radicals, which are generated by irradiation of PTFE in presence of oxygen, and the olefinic unsaturated groups of the oils was used.<br />The modified and charged PTFE micropowder particles prevent the agglomeration by repulsion and therefore also the sedimentation. Processes of structural formation in the dispersions were studied by rheological characterisation and observed into dependence of the PTFE concentration and the chosen kind of PTFE. The tribological characterisation should explore the influence of the chemical coupling reaction between PTFE and oil in the dispersions. In addition, the tribological effect of the dispersions as an additive in a synthetic lubricant was investigated.<br />The results obtained were discussed from rheological and tribological point of view taking into account the effect of the chemical coupling in dependence of the oils used and the chosen PTFE type. Copyright © 2012 John Wiley & Sons, Ltd.
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Publisher
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Lubrication Science
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Wikidata
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Citation
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Lubrication Science 24 (2012) 313-327
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DOI
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https://doi.org/10.1002/ls.1209
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Tags
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