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Abstract
This paper addresses the existence of Persson's theorized adhesion-related, mechanistically distinct rubber friction force–surface deformation hysteresis, or microhysteresis, arising from the sliding interaction of rubber with the microtexture of harder materials. Forty experimentally determined rubber friction data sets obtained by others on macroscopically smooth surfaces and analyzed by the author evidenced the existence of this microhysteretic force, which he theorized to be constant under varying loads. General use of the rubber coefficient of friction as a metric is rendered unreliable by development of this microhysteresis force.
Notes
The specimens were press-vulcanized for 15 minutes at about 142°C.
All natural rubber specimens were vulcanized at a temperature on 140°C. The ingredients are expressed as parts per 100 parts of natural rubber.
*Santocure is a registered trademark of Flexsys, a subsidiary of Solutia Corporation of St. Louis, Missouri, USA.
**Nonox S has been withdrawn from commercial use.
The SBR was masticated on a laboratory roll mill for about 5 minutes at 50°C, followed by mixing on the mill with the addition of the additives for 5 minutes at 50°C. The specimens were then hot-pressed in their respective mold sets, after which they were cooled in a cold press for 60 minutes to 20°C.
All γ values are in mJ/m2.