Download Electrophysical Phenomena in the Tribology of Polymers by A I Sviridewok, A F Kilmovich, V N Kestelman PDF

By A I Sviridewok, A F Kilmovich, V N Kestelman

A number of functional difficulties attached to triboelectric phenomena stay unsolved in either the fabrication and behaviour of polymer threads and materials in a number of business articles. utilizing the result of detailed experiments conducted within the international locations of the previous Soviet Union, this quantity fills a niche within the technology of tribology, offering primary info at the nature of actual and chemical methods governing and accompanying tribodeformation and tribodisintegration of polymers. info on electrophysical phenomena reminiscent of touch electrification and emergence of the electret kingdom in polymer fabrics also are supplied.

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Extra resources for Electrophysical Phenomena in the Tribology of Polymers (Polymer Science and Engineering Monographs, a State-of-the-Art Tutorial Series , Vol 5)

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This results in a double layer formation when the equilibrium Fermi level is achieved. Bredov and Kshemyanskaya [84] have investigated the contact electrification process of two bodies and came to the similar conclusion. 3. Formation of volume charge layer at contact metal (Me) - n-type semiconductor (SC): a, Me and SC before contact; b, Me and SC coming into contact; c, Me - SC contact in equilibrium (Fermi level is shown by dashed line). When charges localize on the dielectric surface, charge-free or negatively charged zones coexist with the positive surface charge, ie the “mosaic” pattern is formed.

The electret field alters the processes of absorption and diffusion on polymer surfaces: absorption and diffusion of liquids and gases into metal- polymer electrets reduces due to electrostatic polarizing interaction between the absorbat and absorbent. Thus, the electrification of polymers at friction results in the inception and development of the electret state. This fact is confirmed by the results of electrophysical studies of contact electretization of dispersed polymers in which a long-lasting electret state has been identified.

The electrical field from the “working” insulated side of the electret is compensated from the voltage source. Extrapolation of Vt to t >> τ from t = 0 yields V(t >> τ), so that from the relation the average disposition of the injected space charge in the electret –x can be determined. The center of distribution of charges can be determined in a polymer electret using a combined induction-depolarization technique [10] consisting of two stages. First, the effective surface charge density σeff on the non-metallized electret surface is measured.

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