Abstract
Natural rubber (NR) vulcanizates and styrene butadiene rubber (SBR) vulcanizates were rubbed against abrasive cloths in vacuum and in various atmospheres. During this experiment the effect of various gases on the friction and wear of the rubber was examined. The friction and wear of NR vulcanizates were higher in room air than in vacuum. This was also true of the friction of SBR vulcanizates, but there was no significant difference between their wear in room air and in vacuum. Similar experiments were made in nitrogen, oxygen and argon. It is proven that the increase in friction and wear is due to the oxygen in the room air. Heavy film deposits were found on the sliding surfaces of mated abrasive cloths in room air and oxygen. It seems that the higher friction and wear resulted from a softened layer formed by oxidation. No significant effect of an antioxidant was found on the abrasion after severe wear. However, antioxidants had a considerable effect on the abrasion after mild rubbing against metal gauzes and decreased friction and wear of vulcanizates that contained the antioxidant were found.
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