By Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)
Polymers and polymer composites were increasinqly utilized in position of metals for varied industries; specifically, aerospace, automobile, bio-medical, computing device, electrophotography, fiber, and rubber tire. hence, an realizing of the interactions among polymers and among a polymer and a inflexible counterface can increase the purposes of polymers lower than a number of environments. In meet ing this desire, polymer tribology has developed to house friction, lubrication and put on of polymeric fabrics and to reply to a few of the difficulties regarding polymer-polymer interactions or oolymer inflexible physique interactions. the aim of this primary overseas Symposium used to be to introduce advances in stories of polymer friction and put on, specifically in Britain and the U.S.S.R. so much previous reviews of the Fifties have been influenced via the expansion of rubber tire industries. non-stop study throughout the Sixties has broadened the bottom to incorporate different polymers comparable 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 infrequently in chemistry journals; possibly, the latter have continually thought of the paintings to be too utilized or too beside the point. no longer until eventually contemporary years have chemists began to become aware of phrases resembling tribo-chemistry or mechano chemistry and progressively notice an imperative position during this box of polymer tribology. therefore, we have been hoping to carry the know-how modern in this SympOSium, specifically to the vast majority of members, polymer chemists via training.
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Extra resources for Advances in Polymer Friction and Wear
In principle, elastomer sliding friction is similar to polymer sliding friction. The major characteristic is that the adhesion component F~ for elastomer sliding friction is also affected by tan o. Bulgin, Hubbard and Walters2~ first showed that the total friction force can be expressed in terms of tan o. Later, Kummer B derived the following semi-empirical expression for unlubricated elastomer sliding friction coefficients: II = lla + llh ' _(ka ~ + kh (~,) n] tan 0 (7) SURFACE ENERGETICS 41 where ~a and ~h are adhesion and hysteresis components; ka' kh adhesional and hysteretic constants for the friction pair; E' modulus, P nominal pressure, rand n are constants.
To demonstrate the importance of separating out the deformation SURFACE ENERGETICS 45 component prior to the comparison of surface energetics, we chose the polymers of the same modulus range from the work of Tanaka s and compared the friction coefficients with critical surface tensions y ~2. S relationship fairly comparable. Without knowing the extent of the deformation component, if any, in Tanaka's total friction force data S , we find the correlation in Fig. 4 to be rather encouraging for polymers within a similar range of modulus.
Since the data 19 involved has only three points, we can not conclude whether this trend could apply to all other polymers. However, the above two examples can serve to demonstrate the hidden role of surface energetics in polymer friction, especially the L. H. LEE 46 adhesion component. In the coming sections, we shall illustrate the effect of other specific surface interactions on unlubricated polymer sliding friction. 2 OL-______ ~ o ________- L________L __ _ _ _ _ _ w ~ CRITICAL SURFACE TENSION, Fig.