By Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)
Polymers and polymer composites were increasinqly utilized in position of metals for numerous industries; particularly, aerospace, automobile, bio-medical, computing device, electrophotography, fiber, and rubber tire. hence, an figuring out of the interactions among polymers and among a polymer and a inflexible counterface can increase the functions of polymers below numerous environments. In meet ing this desire, polymer tribology has developed to house friction, lubrication and put on of polymeric fabrics and to respond to a few of the difficulties concerning polymer-polymer interactions or oolymer inflexible physique interactions. the aim of this primary foreign Symposium used to be to introduce advances in reports of polymer friction and put on, specially in Britain and the U.S.S.R. such a lot past reviews of the Fifties have been influenced via the expansion of rubber tire industries. non-stop learn during the Sixties has broadened the bottom to incorporate different polymers similar to nylon, polyolefins, and poly tetra fluoroethylene, or PTFE. notwithstanding, a lot of this paintings used to be released in engineering or physics journals and barely in chemistry journals; most likely, the latter have continuously thought of the paintings to be too utilized or too beside the point. now not till contemporary years have chemists began to become aware of phrases equivalent to tribo-chemistry or mechano chemistry and progressively detect an essential position during this box of polymer tribology. hence, we have been hoping to convey the know-how brand new in this SympOSium, in particular to nearly all of contributors, polymer chemists by way of training.
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Extra resources for Advances in Polymer Friction and Wear
Tabor: When we talk of the shearing strength of a lubricant film, we are thinking of the film as a solid. The shearing strength is thus a strength property resembling, say, the critical shear stress of a metal. It may depend on shear rate, but over a fairly wide range of conditions it is a material constant. If, however, we think of the lubricant film as being a liquid, the stress required to produce shear depends critically on the shear rate. Over a wide range of conditions, the shear stress will indeed be proportional to the shear rate.
O~---~----~----~---~----~ o Fig. 3. 10 20 30 40 CRITIAL SURFACE TENSION, )'(: , dyne/cm(20·C) 50 Effect of Critial Surface Tension on Static Friction Coefficient of Polymers Against Steel (This data from NRL (Ref. f;1 5) (13) The authors claimed that with the above correction for F were able to obtain a better correlation between SIp and polymers studied by King and Tabor41. S they for Recently, Savkoor 3 found a thermodynamic relationship which could support the adhesion theory of friction: Wa = YL (1 + cos e), (14) where Wa is the work of adhesion; YL surface tension of a liquid; and e the contact angle.
3. 4. 5. 6. 7. 8. 9. 10. II. 12. J. A. Greenwood and D. Tabor, Proc. Phys. Soc. 71, 989 (1958). K. C. Ludema and D. A. J. E. J. Dupuit, Comptes Rendus, 9, 698: 775 (1839). S. C. Hunter, J. AppJ. , 28, 61T (1961). J. F. Archard, private communication. D. Atack and W. D. May, Pulp and Paper Magazine of Canada, Conf. Issue (1958). F. P. Bowden, A. J. W. Moore and D. Tabor, J. Appl. , ~, 80 (1943). F. P. Bowden and D. Tabor, The Friction and Lubrication of Solids, Clarendon Press Oxford, Vol. I, 1950, Vol I I, 1964.
Advances in Polymer Friction and Wear by Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)