Abstract
Ball‐on‐disk tests were performed to investigate the effects of photoaging on the tribological properties of engineering plastics under dry sliding. Results exhibit that different molecular structures of plastics result in different aging morphologies, and ultra high molecular weight polyethylene has better resistance to photoaging than polyformaldehyde (POM). However, POM has better wear resistance before and after the photoaging. Marked increase of the width and depth of wear tracks is observed after aging. Analysis of worn surface has revealed that photoaging significantly affects the wear mechanism of ultra high molecular weight polyethylene and POM. Although the major wear mechanism before the aging of materials is identified as plastic deformation and adhesive wear, it becomes quite complicated when the materials experienced photoaging. Such complex wear mechanism hence deteriorates the tribological performance of the engineering plastics. Copyright © 2014 John Wiley & Sons, Ltd.
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