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Polymer–polymer friction as a function of test speed
Author(s) -
Gascó M. C.,
Rodriguez F.,
Long T.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980314)67:11<1831::aid-app1>3.0.co;2-m
Subject(s) - polymer , materials science , polyethylene , composite material , torsion pendulum clock , high density polyethylene , polytetrafluoroethylene , friction coefficient , pendulum , range (aeronautics) , polymer chemistry , mechanical engineering , physics , quantum mechanics , engineering
Tests of sliding friction between identical polymer films have been carried out at sliding speeds of 0.0001 to over 10 m/s. In order to make measurements over such a wide range of speeds, three devices are employed. In each apparatus, a moving member with two identical polymer surfaces slides between two stationary blocks covered with the same polymer. The slow‐moving crossarm of a standard Instron tester provides speeds of 0.0085 to 0.21 cm/s. A horizontal sled apparatus provides speeds of 1 to 10 cm/s. Finally, a modified impact test machine uses a pendulum that moves at about 3 m/s. Results with four polymer films illustrate a variety of behavior. The coefficient of friction, μ, for cellulose acetate decreases with increasing speed. Films of low‐density polyethylene and polytetrafluoroethylene show increases in μ with speed. A film of ultrahigh molecular weight polyethylene shows only a slight decrease in μ with speed. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1831–1836, 1998