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

ISBN-10: 9056995774

ISBN-13: 9789056995775

A variety of functional difficulties hooked up to triboelectric phenomena stay unsolved in either the fabrication and behaviour of polymer threads and materials in a number of commercial articles. utilizing the result of certain experiments conducted within the nations of the previous Soviet Union, this quantity fills a spot within the technology of tribology, proposing primary info at the nature of actual and chemical strategies governing and accompanying tribodeformation and tribodisintegration of polymers. information on electrophysical phenomena resembling touch electrification and emergence of the electret kingdom in polymer fabrics also are supplied.

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The blocking metal electrodes are employed. The measuring electrode and the specimen are separated by the 100 µm thick polytetrafluorethylene (PTFE) spacer. In case of repeated experiments, the signals from the amplifier and the thermocouple can be directed into the computer through the interface system for saving and processing of the mathematical data: such as computations of the values of parameters and the number of traps, the values of the parameters of relaxation processes, and so forth. There are several techniques for evaluating the results of TSC measurements, such as the one used for “close” contacts between the electrodes and the electret [10].

The “effective” surface charge density σeff, unlike the ”true” density determining the charge density on the electret surface, characterizes both the surface charge and the volume charge distribution. The electret charge variation as a function of time after polarization is determined by the time variations of the residual polarization, free charges migration, and appearance of relaxation polarization . 24) relates to the capture of injected carriers by tiny traps near the dielectric surface. Its role is especially important for static electrification and charging of corona discharge.

A polymer film contacts another polymer film, ie a polymer-polymer couple is formed. 2. Block-diagram of an experimental set-up for measuring triboelectrification and friction parameters of polymer films: 1, polymer film – base; 2, “grounded” copper cylinder; 3, aperture in base and cylinder; 4, tested specimen – polymer film; 5, electrode; 6, electrometric measuring probe; 7, electrometer; 8, recorder; 9, strain gage amplifier; 10, loading device; 11, chamber with controllable temperature and humidity.

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Electrophysical phenomena in the tribology of polymers by A I Sviridewok, A F Kilmovich, V N Kestelman

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