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Electrical conduction studies in polyethylene

In recent years a variety of conduction mechanisms have been proposed for natural polyethylene including electrode-limited processes such as field-enhanced Schottky emission,1 or bulk-limited processes such as Poole-Frenkel conduction2, 3 and space-charge limited conduction4–6. While it is generally accepted that carrier migration in high polymers is characterized by a hopping mechanism between localized states, little is known of the nature of these states and the origin of the charge carriers. This paper deals with several aspects of electrical conduction in molded specimens of natural polyethylene and focuses on the effects of applied voltage, temperature, and electrode materials. Detailed studies of the steady-state and transient conduction regimes have revealed that carrier migration appears to be bulk-limited up to at least 2 × 105 V/cm and related to the motion of injected and trapped space-charge through the volume.