ELECTRICAL NOISE CHARACTERISTICS OF CARBON BLACK-FILLED LINEAR LOW-DENSITY POLYETHYLENE NEAR THE PERCOLATION-THRESHOLD

Electrical noise measurements have been used to study electrical condu ction in carbon black-filled linear low density polyethylene. Measurem ents of the resistivity. real part of the relative permittivity, therm al noise, and current noise have been carried out for carbon black con tents and temperatures below, near, and above the percolation threshol d for electrical conduction. The current noise shows a 1/f(alpha) freq uency dependence, with alpha near unity close to the percolation thres hold, but increasing to 1.5 at higher resistivities or temperatures.