By Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)
Polymers and polymer composites were increasinqly utilized in position of metals for varied industries; particularly, aerospace, car, bio-medical, desktop, electrophotography, fiber, and rubber tire. therefore, an realizing of the interactions among polymers and among a polymer and a inflexible counterface can improve the purposes of polymers less than numerous environments. In meet ing this desire, polymer tribology has developed to accommodate friction, lubrication and put on of polymeric fabrics and to respond to many 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, particularly in Britain and the U.S.S.R. such a lot past reviews of the Fifties have been encouraged by way of the expansion of rubber tire industries. non-stop learn during the Sixties has broadened the bottom to incorporate different polymers equivalent 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 consistently thought of the paintings to be too utilized or too inappropriate. now not until eventually contemporary years have chemists began to detect phrases resembling tribo-chemistry or mechano chemistry and steadily discover an crucial function during this box of polymer tribology. therefore, we have been hoping to convey the know-how modern in this SympOSium, in particular to nearly all of individuals, polymer chemists through training.
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One method used in large machinery is by externally pressurizing the system. Another is by forming an electrically charged double-layer of similar sign on the surfaces. This is the classical stabli~ing force in colloidal systems. Such films, of the order of IOOA thick, can successfully support a pressure of the order of about I atmosphere. This is far less than the pressure developed between metal surfaces at the tips of contacting asperities but it is of the order of magnitude of the pressure developed between soft rubbers (Roberts and Tabor~8).
Fig. 2. -bonded molecules; Wa,energy ()f adhesion bond; FT, free energy of activation. If the polymer friction at the rubbery state indeed involves the adhesion mechanism, the ,ctivation energy already contains a deformation energy component F which is generally larger than the thermodynamic work of adhesion, W. The presence of FT prevents a clear comparison of Wa1s among porymers, and also introduces unnecessary confusion about the validity of the adhesion mechanism. Because of the stronger influence of the deformation energy than the thermodynamic work of adhesion, one may argue that the adhesion mechanism is groundless.
Advances in Polymer Friction and Wear by Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)