1969 Volume 42 Issue 10 Pages 2820-2827
The electrophotographic properties of titanium dioxide-polymer dispersion layers were studied. The titanium dioxide powder of the rutile type and three well-known polymers, polyvinyl acetate, polyvinyl chloride, and polystyrene, were used. The measurements were done on the corona-charging properties, e. g., the resistivity and the capacitance of the layer, the rising gradient of the surface potential, and the fatigue effect of pre-illumination. The results make it clear that the analysis of an equivalent circuit can be applied to the interpretation of the rising gradient of the surface potential and to that of the dark decay to some extent. Moreover, it is found that the logarithm of the potential of the dark decay decreases proportionally to the cube root of the time at the initial step, while, at the next following step, it decays proportionally to the square root of the time. The mechanism of the dark decay of the surface potential is also discussed.
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