By Yukisaburo Yamaguchi
This publication provides a radical assessment on practicable theories and trustworthy experimental info at the use of plastic fabrics for sliding components. [p] Divided into 4 elements. Chapters 1 and a couple of take care of present theories of friction and put on, and comprise dialogue of assorted hypotheses dependent upon experimental stories. bankruptcy three info experiments designed to enhance tribological functionality through polymer mixing and composite creation, while bankruptcy four explains how the information bought from those experiemnts should be utilized to sliding laptop components. The paintings will turn out important within the layout of plastic fabrics and elements and also will supply a stepping-stone towards destiny options during this box.
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Extra resources for Tribology of Plastic Materials: Their Characteristics and Applications to Sliding Components
Sample text
51 Relationship between R u jfk : 6oCm/s and stretching d or x for PTFE POM p : 3 kgf/cm 3 0.. 51 shows the relationship between pk and stretch or parallel degree for PET, and Fig. 52 shows the relationship between pk or specific wear rate V, and stretch or parallel degree for POM. The relationship for PET is similar to that of PE as presented above, and j f k value for the stretching direction does not change but the V, value for the stretching direction greatly decreases with increasing stretch or parallel degree.
The concept of the shearing resistance between the two molecules A and B can also be considered from a morphological standpoint disregarding bonding energy. For example, the atomic arrangements of PE and polystyrene (PS) are shown in Fig. 26. The side a t o m s of hydrogen (H) in t h e P E molecule a r e located symmetrically along the axis of the main carbon (C) chain, and the outside line of H atoms is parallel t o the axis and smooth. In PS, however, the side chain of H atoms and benzene rings a r e situated asymmetrically along the main chain, so the outside profiles of t h e side chains are irregular along t h e axis.
In PS, however, the side chain of H atoms and benzene rings a r e situated asymmetrically along the main chain, so the outside profiles of t h e side chains are irregular along t h e axis. I t would b e expected that the shearing resistance between molecules is likely t o be much larger for an asymmetrical arrangement of atoms than for a symmetrical one. Therefore, in considering the friction coefficient of plastic materials, the degree of symmetry of the molecular structure must be taken into account, in addition to the shearing resistance needed t o break the molecular bonds.
